open2300: quote TARGET_{CC,LD}

TARGET_CC / TARGET_LD may contain spaces (E.G. when ccache is used), so
ensure they are properly quoted when passed to make.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/open2300/open2300.mk

@@ -17,7 +17,7 @@ ifeq ($(BR2_PACKAGE_MYSQL),y)
 endif
 
 define OPEN2300_BUILD_CMDS
-	$(MAKE) CC=$(TARGET_CC) LD=$(TARGET_LD) -C $(@D) $(OPEN2300_BINS)
+	$(MAKE) CC="$(TARGET_CC)" LD="$(TARGET_LD)" -C $(@D) $(OPEN2300_BINS)
 endef
 
 define OPEN2300_INSTALL_TARGET_CMDS