autotools: allow host package to use <pkg>_MAKE_ENV and <pkg>_MAKE

This will be needed by the Python interpreter package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Makefile.autotools.in

@@ -200,7 +200,7 @@ endif
 #
 ifndef $(2)_INSTALL_CMDS
 define $(2)_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $$($$(PKG)_SRCDIR) install
+	$(HOST_MAKE_ENV) $$($$(PKG)_MAKE_ENV) $$($$(PKG)_MAKE) -C $$($$(PKG)_SRCDIR) install
 endef
 endif