lang/perl: Filter -g3 in TARGET_CFLAGS

lang/perl: Filter -g3 in TARGET_CFLAGS

-g3 will make the build fail in Compress-Raw-Zlib with
  ld: final link failed: Memory exhausted
This bug is actually documented[1] and fixed by filtering that flag. Since
we're passing CFLAGS manually, we need to do the same to make things work.
I suspect that this is actually a linker or library bug, but for now let's
just replicate the official fix.

[1] https://rt.cpan.org/Public/Bug/Display.html?id=88936

Signed-off-by: Marcel Denia <[email protected]>