drop PCRE test (not used,  php_zip_pcre is unconditionaly defined)
drop duplicate include (already in php_zip.h)
drop duplicate include (already in php_zip.h)
fix warning: variable 'file' set but not used [-Wunused-but-set-variable]
 warning: 'remove_path_len' may be used uninitialized in this function [-Wmaybe-uninitialized] (just to make gcc happy)
use public zip_error_clear instead of private _zip_error_clear
Merge pull request #3 from remicollet/issue-minor

Cleanups and fix build warnings