fix libstdcxx issues

package/libstdcxx/Makefile

@@ -5,7 +5,7 @@ include ${TOPDIR}/rules.mk
 
 ifeq ($(ADK_TARGET_LIB_GLIBC),y)
 include ${TOPDIR}/toolchain/glibc/Makefile.inc
-else
+endif
 ifeq ($(ADK_TARGET_LIB_MUSL),y)
 include ${TOPDIR}/toolchain/musl/Makefile.inc
 endif

toolchain/gcc/Makefile

@@ -226,8 +226,8 @@ else
 		ln -sf $(GNU_TARGET_NAME)-ld.bfd $(GNU_TARGET_NAME)-ld)
 endif
 	cd $(STAGING_TARGET_DIR)/lib && \
-		ln -sf libstdc++.so.6.0.18 libstdc++.so && \
-		ln -sf libstdc++.so.6.0.18 libstdc++.so.6
+		ln -sf libstdc++.so.6.0.19 libstdc++.so && \
+		ln -sf libstdc++.so.6.0.19 libstdc++.so.6
 	# cleanup unneeded docs
 	rm -rf $(TOOLCHAIN_DIR)/usr/share
 	touch $@