apxs: fix handling of -Wc/-Wl and "-o mod_foo.so".

PR:	31448
Obtained from:
Submitted by:	jorton
Reviewed by:	jorton, jerenkrantz, pquerna


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@105564 13f79535-47bb-0310-9956-ffa450edef68