[8u60] RFR: 8043340: [macosx] Fix hard-wired paths to JavaVM.framework

[David DeHaven]

>> The --with-xcode-path argument is optional, you should also be able to build with Xcode 4 selected via "sudo xcode-select -switch /path/to/Xcode4.app". I leave MAS managed Xcode (currently 6) active as I'm constantly bouncing between projects and it's a hassle to have to remember to reset the active toolchain, so I thought it best to allow configure to be provided a path.
> 
> Ugh. I broke something along the way, this doesn't *quite* work.
> 
> xcrun complains with "xcrun: error: missing DEVELOPER_DIR path:"
> 
> I think I'm exporting an empty DEVELOPER_DIR. I shall fix and update.

TL;DR: Please review round 2:
http://cr.openjdk.java.net/~ddehaven/8043340/jdk8u/v1/

(I removed generated-configure.sh to reduce the review size, it will be re-generated prior to pushing)


I've tested the following configuration scenarios (output from a shell script I cobbled together..)

field values:
XC6 - Xcode 6 installed in /Applications/Xcode.app
XC4 - Xcode 4 installed in some other dir
(empty) - Argument not passed to configure

Result meanings:
DEV_DIR set - configure succeeded, DEVELOPER_DIR was properly exported in spec.gmk
DEV_DIR NOT set - configure succeeded, DEVELOPER_DIR was not needed (XC4 must be selected to achieve this)
Configure failed - Configure properly failed when it detected Xcode > 4

"Selected" Xcode means version reported by xcode-select -p


| Xcode selected | --with-xcode-path | DEVELOPER_DIR     | result           |
-----------------------------------------------------------------------------
| XC4            |                   |                   | DEV_DIR NOT set  |
-----------------------------------------------------------------------------
| XC4            |                   | XC4               | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC4            |                   | XC6               | Configure failed |
-----------------------------------------------------------------------------
| XC4            | XC4               |                   | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC4            | XC4               | XC4               | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC4            | XC4               | XC6               | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC4            | XC6               |                   | Configure failed |
-----------------------------------------------------------------------------
| XC4            | XC6               | XC4               | Configure failed |
-----------------------------------------------------------------------------
| XC4            | XC6               | XC6               | Configure failed |
-----------------------------------------------------------------------------
| XC6            |                   |                   | Configure failed |
-----------------------------------------------------------------------------
| XC6            |                   | XC4               | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC6            |                   | XC6               | Configure failed |
-----------------------------------------------------------------------------
| XC6            | XC4               |                   | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC6            | XC4               | XC4               | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC6            | XC4               | XC6               | DEV_DIR set      |
-----------------------------------------------------------------------------
| XC6            | XC6               |                   | Configure failed |
-----------------------------------------------------------------------------
| XC6            | XC6               | XC4               | Configure failed |
-----------------------------------------------------------------------------
| XC6            | XC6               | XC6               | Configure failed |
-----------------------------------------------------------------------------

All the results are as expected. Please note that --with-xcode-path overrides DEVELOPER_DIR, since that could be set in the environment.

(yeah, I went a little OCD on this...)

-DrD-