Fix icon on Windows with MinGW/MSYS2 builds, from Ala-lala

sc2/Makefile.build

@@ -56,7 +56,7 @@ $(OBJDIR)%.m.d: $(BUILD_ROOT)%.m
 	fi
 	$(call act,act_mkdep_m,MKDEP  ,$@)
 
-%.rc.o: %.rc
+$(OBJDIR)%.rc.o: $(BUILD_ROOT)%.rc
 	@DIR=$(dir $@); \
 	if [ ! -d $$DIR ]; then \
 		mkdir -p "$$DIR"; \

sc2/build/unix/build.sh

@@ -99,7 +99,7 @@ if [ -z "$TARGET" ]; then
 fi
 BUILD_PROJECT="$TARGET"
 export TARGET BUILD_PROJECT ECHON
-export PREPROC_C MKDEP_C COMPILE_C PREPROC_CXX MKDEP_CXX COMPILE_CXX PREPROC_OBJC MKDEP_OBJC COMPILE_OBJC LINK
+export PREPROC_C MKDEP_C COMPILE_C PREPROC_CXX MKDEP_CXX COMPILE_CXX PREPROC_OBJC MKDEP_OBJC COMPILE_OBJC WINDRES LINK
 export "${BUILD_PROJECT}_CFLAGS" "${BUILD_PROJECT}_CXXFLAGS" "${BUILD_PROJECT}_LDFLAGS"
 
 # Add trailing / from objs dir

sc2/src/res/Makeinfo

@@ -1,6 +1,6 @@
 case "$HOST_SYSTEM" in
 	MINGW32*)
-		uqm_EXTRA_OFILES="UrQuanMasters.rc.o"
+		uqm_RCFILES="UrQuanMasters.rc"
 		;;
 esac