Disable GCC variable tracking when compiling PHP/Java wrappers

[jng]

When compiling the PHP and Java wrappers, the following message is shown every time.

note: variable tracking size limit exceeded with -fvar-tracking-assignments, retrying without

Since it seems that VTA will never work for these projects, there's no point wasting time trying to build these projects with settings that will never work which will require a subsequent re-build without said settings, we should apply this flag for such projects:

-fno-var-tracking-assignments

Which will skip this time-wasting step.

[jng]

Fixed r8433