mysql: fix a compile error on some host systems.

conf_to_src.c uses C++ functions so we should use g++ for compiling.
The CFLAGS, CPPFLAGS and LDFLAGS for host build should be used and not the for target builds.

This closes #8342


git-svn-id: svn://svn.openwrt.org/openwrt/packages@26540 3c298f89-4303-0410-b956-a3cf2f4a3e73

libs/mysql/Makefile

@@ -120,10 +120,10 @@ define Build/Compile
 		DESTDIR="$(PKG_INSTALL_DIR)" \
 		install
 	$(MAKE) $(PKG_JOBS) -C "$(PKG_BUILD_DIR)/libmysql" \
-		CC="$(HOSTCC)" \
-		LINK="$(HOSTCC) -o conf_to_src -lc" \
-		CFLAGS="" \
-		CPPFLAGS="" \
+		CC="g++" \
+		CFLAGS="$(HOST_CFLAGS)" \
+		CPPFLAGS="$(HOST_CFLAGS)" \
+		LDFLAGS="$(HOST_LDFLAGS)" \
 		conf_to_src
 	$(MAKE) $(PKG_JOBS) -C "$(PKG_BUILD_DIR)" \
 		SUBDIRS="libmysql" \