Fix regeneration of build datestamp on every make invocation (a

regression since 1.3).

* Makefile.in: Remove redundant PHONY_TARGETS setting.

* server/Makefile.in: Mark buildmark.c as phony; build it indirectly
via buildmarked.c since implicit rules are ignored for phony targets.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102243 13f79535-47bb-0310-9956-ffa450edef68