RFR: JDK-8210729 Clean up macosx static library handling

Thu Sep 13 22:06:56 UTC 2018

There's a bunch of interrelated smelly code regarding static libraries 
on macosx.

I started by turning libfdlibm into a static library on macosx, as on 
all other platforms. It turned out that we don't have proper support for 
static libraries on macosx, so I fixed this too.

Secondly, I removed the libjli_static.a for macosx. There is no good 
reason to have it. It's probably just a left-over from the old Apple 
port to macosx. This in turn prompted some additional related cleanup in 
LauncherCommon.gmk.

Bug: https://bugs.openjdk.java.net/browse/JDK-8210729
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8210729-cleanup-macosx-static-library-handling/webrev.01

/Magnus