Apache was segfaulting frequently after loding mod_gzip.
That was due to name clash with other modules like
Same symbol names in php-zlib and mod_gzip - that was
causing segfault in for example longest_match() from zlib
(instead of using mod_gzip version of longest_match zlib
version was used).
Fix is to make all mod_gzip_compress.c functions and
variables static (visible only to mod_gzip) and rename
Attached patch fixes that. Tested.