fix: do note assume "make", use $(MAKE)

(cherry picked from commit 1c96432)

Author: miniupnp

mingw/pkg-support/Makefile

@@ -5,18 +5,18 @@ CROSS_PATH := /usr/local
 ARCHITECTURES := i686-w64-mingw32 x86_64-w64-mingw32
 
 all install:
-	@echo "Type \"make native\" to install 32-bit to /usr"
-	@echo "Type \"make cross\" to install 32-bit and 64-bit to $(CROSS_PATH)"
+	@echo "Type \"$(MAKE) native\" to install 32-bit to /usr"
+	@echo "Type \"$(MAKE) cross\" to install 32-bit and 64-bit to $(CROSS_PATH)"
 
 native:
-	make install-package arch=i686-w64-mingw32 prefix=/usr
+	$(MAKE) install-package arch=i686-w64-mingw32 prefix=/usr
 
 cross:
 	mkdir -p $(CROSS_PATH)/cmake
 	cp -rv cmake/* $(CROSS_PATH)/cmake
 	for arch in $(ARCHITECTURES); do \
 	    mkdir -p $(CROSS_PATH)/$$arch; \
-	    make install-package arch=$$arch prefix=$(CROSS_PATH)/$$arch; \
+	    $(MAKE) install-package arch=$$arch prefix=$(CROSS_PATH)/$$arch; \
 	done
 
 install-package: