RFR: JDK-8029908: jdk 8u5 mac build produces incorrect version string 1.8.0_5

[Erik Joelsson]

Hello,

Please review this simple little workaround for jdk-update-version. On 
macosx 10.7, the expr command is broken and the following will not work 
as on other platforms (or macosx 10.8):

expr "--with-update-version=05" : '[^=]*=\(.*\)'

On the other platforms, this will return "05" but on 10.7 it returns 
"5". Autoconf uses this construct to parse command line parameters. 
Because of this, we are unable to assign the value "05" to 
--jdk-update-version.

Since in the build, we always treat the update version as 2 digits, the 
simple workaround is to zero pad the value for this variable if it is 
only one character long.

Webrev: http://cr.openjdk.java.net/~erikj/8029908/webrev.root.01/

/Erik