Remove bogus .PHONY declaration from version.h target.

Should fix make dep to be invoked before distclean under some circumstances.

Originally committed as revision 6405 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -92,7 +92,6 @@ ffplay_g$(EXESUF): ffplay.o cmdutils.o .libs
 	cp -p $< $@
 	$(STRIP) $@
 
-.PHONY: version.h
 version.h:
 	$(SRC_PATH)/version.sh "$(SRC_PATH)"