* configure.ac: Add -Werror=implicit-function-declaration to CFLAGS if    the compiler supports this flag.
* configure.ac: Add -Werror=implicit-function-declaration to CFLAGS if
   the compiler supports this flag.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion