www/apache24: Fix some warnings:
Error: /usr/local/bin/ab is linked to /usr/local/lib/libdb-5.3.so.0 from databases/db5 but it is not declared as a dependency
Warning: you need USES+=bdb
Error: /usr/local/bin/ab is linked to /usr/local/lib/libgdbm.so.6 from databases/gdbm but it is not declared as a dependency
Warning: you need LIB_DEPENDS+=libgdbm.so:databases/gdbm
PR: 238490