disable patching of GCC to make it prefer /lib over /lib64 to avoid breaking the build

[boegel]

In easybuilders/easybuild-easyblocks#1030, patching of GCC was enabled to make it prefer /lib over /lib64 directories.

This causes problems with older versions of GCC (4.7.2 and earlier, except for 4.6.4):

/usr/lib/crti.o: could not read symbols: File in wrong format
collect2: ld returned 1 exit status

with:

$ file /usr/lib/crti.o
/usr/lib/crti.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not stripped

This change simply disables the patching, to fix the build.
If needed, this can be revisited once the cause of the problem (and a fix) is figured out...

cc @sebth

[boegel]

superseded by disabling prefer_lib_subdir by default in the GCC easyblock, see easybuilders/easybuild-easyblocks#1035

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 14 out of 14 (14 easyconfigs in this PR)
node2055.delcatty.os - Linux SL 6.8, Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, Python 2.6.6
See https://gist.github.com/1d6d29bb79c1a91f59b153b69c9bf920 for a full test report.