Fix incremental builds using make

Add .PHONY to to the release and debug library targets so running make
does the right thing after changing the source.

It is possible to use cargo directly, but this means a developer need to
also run the more commands manually for each build which is error prone.

Signed-off-by: Nir Soffer <[email protected]>

Author: nirs

Makefile

@@ -74,7 +74,7 @@ ifeq ($(PREFIX),)
     PREFIX := /usr/local
 endif
 
-.PHONY: install clean
+.PHONY: install clean $(LIBRARY_RELEASE_$(OS)) $(LIBRARY_DEBUG_$(OS))
 
 all: $(LIBRARY_RELEASE_$(OS)) libkrun.pc