[8u] RFR: 8148351: Only display resolved symlink for compiler, do not change path

[Severin Gehwolf]

Hi,

After discussion in [1], please review this revised JDK 8u backport of
JDK-8148351. When the compiler is a symlink to ccache it'll continue to
use it's work-around to keep the Oracle JDK 8 build working. If the
compiler isn't a symlink it'll print this as a configure message and
won't do the ccache work-around (which it did prior this patch). 

Example:

Before:

checking for gcc... /usr/bin/gcc
checking resolved symbolic links for CC... /usr/bin/gcc
checking if CC is disguised ccache... no, keeping CC
configure: Using gcc C compiler version 8.1.1 [gcc (GCC) 8.1.1 20180502 (Red Hat 8.1.1-1)]

After:

checking for gcc... /usr/bin/gcc
checking resolved symbolic links for CC... no symlink
configure: Using gcc C compiler version 8.1.1 [gcc (GCC) 8.1.1 20180502 (Red Hat 8.1.1-1)]

webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8148351/webrev.02/

Thoughts?

Thanks,
Severin

[1] http://mail.openjdk.java.net/pipermail/build-dev/2018-June/022444.html