Log message:
Set GCC_TARGET_MACHINE so RPATH set correctly to pickup libs from gcc6-libs

Bump PKGREVISION

Log message:
Bump PKREVISION for gcc6 pch fixes

Log message:
gcc6: update to 6.5.0. Maintenace update.

There are no new features listed on the changelog.
250 bug reports are fixed, listed by this link:
https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=6.5

Log message:
gcc6: don't try to make references to stack_chk_fail_local on netbsd/sun
sun was added as joyent is patching for the same.

this code is only reached if compiling for i386 (or some variation of ppc)
netbsd's stack_chk_fail_local won't work for this.

PR pkg/53436.

Log message:
gcc6-libs: bump PKGREVISION to be higher than gcc6's one.

PR pkg/53435

Log message:
Fix indentation in buildlink3.mk files.

The actual fix as been done by "pkglint -F */*/buildlink3.mk", and was
reviewed manually.

There are some .include lines that still are indented with zero spaces
although the surrounding .if is indented. This is existing practice.

Log message:
Replaced $(ROUND) with ${CURLY} variable references.

This has been a pkglint warning for several years now, and pkglint can even
fix it automatically. And it did for this commit.

Only in lang/mercury, two passes of autofixing were necessary because there
were nested variables.

Log message:
gcc6-lib: bump pkgrevision above gcc6

Log message:
Reset PKGREVISION

Log message:
Use public SHLIB_TYPE instead of private _OPSYS_SHLIB_TYPE.