replace hard coded dependency on gcc

fix: #433
Signed-off-by: Pepper Gray <[email protected]>

Author: peppergrayxyz

Makefile

@@ -103,7 +103,7 @@ debug: $(LIBRARY_DEBUG_$(OS)) libkrun.pc
 ifeq ($(BUILD_INIT),1)
 INIT_BINARY = init/init
 $(INIT_BINARY): $(INIT_SRC)
-	gcc -O2 -static -Wall $(INIT_DEFS) -o $@ $(INIT_SRC) $(INIT_DEFS)
+	$(CC) -O2 -static -Wall $(INIT_DEFS) -o $@ $(INIT_SRC) $(INIT_DEFS)
 endif
 
 $(LIBRARY_RELEASE_$(OS)): $(INIT_BINARY)