https://bugs.gentoo.org/550244

taken from Fedora:
http://pkgs.fedoraproject.org/cgit/mod_perl.git/tree/mod_perl-2.0.4-inline.patch?h=f22

fixes building with gcc-5:
apache2: Syntax error on line 148 of /etc/apache2/httpd.conf:
Syntax error on line 2 of /etc/apache2/modules.d/75_mod_perl.conf:
Cannot load modules/mod_perl.so into server:
/usr/lib64/apache2/modules/mod_perl.so: undefined symbol: modperl_handler_name

--- mod_perl-2.0.4/src/modules/perl/modperl_common_util.h.inline
+++ mod_perl-2.0.4/src/modules/perl/modperl_common_util.h
@@ -22,7 +22,7 @@
 #ifdef MP_DEBUG
 #define MP_INLINE
 #else
-#define MP_INLINE APR_INLINE
+#define MP_INLINE
 #endif
 
 #ifdef CYGWIN