make - touch ceed-config.c first

Author: jeremylt

Makefile

@@ -858,7 +858,8 @@ $(OBJDIR)/ceed.pc : pkgconfig-prefix = $(prefix)
 GIT_DESCRIBE = $(shell git describe --always --dirty 2>/dev/null || printf "unknown\n")
 
 $(OBJDIR)/interface/ceed-config.c: Makefile
-	@$(file >$@,#include <ceed-impl.h>) \
+	@touch $(OBJDIR)/interface/ceed-config.c
+	$(file >$@,#include <ceed-impl.h>) \
 	$(file >>$@,) \
 	$(file >>$@,int CeedGetGitVersion(const char **git_version) {) \
 	$(file >>$@,  *git_version = "$(GIT_DESCRIBE)";) \