[package] openssl: don't fail with empty TARGET_LDFLAGS

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29770 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/openssl/Makefile

@@ -142,7 +142,7 @@ define Build/InstallDev
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/lib{crypto,ssl}.{a,so*} $(1)/usr/lib/
 	$(INSTALL_DIR) $(1)/usr/lib/pkgconfig
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/{openssl,libcrypto,libssl}.pc $(1)/usr/lib/pkgconfig/
-	$(SED) 's#$(TARGET_LDFLAGS)##g' $(1)/usr/lib/pkgconfig/{openssl,libcrypto,libssl}.pc
+	$(if $(TARGET_LDFLAGS),$(SED) 's#$(TARGET_LDFLAGS)##g' $(1)/usr/lib/pkgconfig/{openssl,libcrypto,libssl}.pc)
 endef
 
 define Package/libopenssl/install