Makefile: Make libkrun.pc target .PHONY and generate it on install

The install target should depend on generation of the libkrun.pc file,
because it installs it.
The libkrun.pc target should be .PHONY because libkrun.pc file might
already exists and be generated, but it could be made using a different PREFIX,
which would lead to the installed libkrun.pc pointing to the wrong prefix.

Signed-off-by: Matej Hrica <mhrica@redhat.com>

Author: mtjhrc

Makefile

@@ -74,7 +74,7 @@ ifeq ($(PREFIX),)
     PREFIX := /usr/local
 endif
 
-.PHONY: install clean $(LIBRARY_RELEASE_$(OS)) $(LIBRARY_DEBUG_$(OS))
+.PHONY: install clean $(LIBRARY_RELEASE_$(OS)) $(LIBRARY_DEBUG_$(OS)) libkrun.pc
 
 all: $(LIBRARY_RELEASE_$(OS)) libkrun.pc
 
@@ -124,7 +124,7 @@ libkrun.pc: libkrun.pc.in Makefile
 	    libkrun.pc.in > $@-t
 	mv $@-t $@
 
-install:
+install: libkrun.pc
 	install -d $(DESTDIR)$(PREFIX)/$(LIBDIR_$(OS))/
 	install -d $(DESTDIR)$(PREFIX)/$(LIBDIR_$(OS))/pkgconfig
 	install -d $(DESTDIR)$(PREFIX)/include