python-mysql: fix uclibc build failure

libmariadb 10.2.x needs to be linked in together with iconv. On uclibc
iconv is not included in libc and libiconv-full needs to be used. This
commit helps python-mysql find the shared library.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

lang/python/python-mysql/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-mysql
 PKG_VERSION:=1.3.12
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=GPL-2.0
 
 PKG_SOURCE:=mysqlclient-$(PKG_VERSION).tar.gz
@@ -24,6 +24,14 @@ include ../python3-package.mk
 
 PKG_UNPACK:=$(HOST_TAR) -C $(PKG_BUILD_DIR) --strip-components=1 -xzf $(DL_DIR)/$(PKG_SOURCE)
 
+# Help python-mysql find libiconv.so when using uClibc.
+ifneq ($(CONFIG_USE_UCLIBC),)
+TARGET_CPPFLAGS+= \
+	-I$(STAGING_DIR)/usr/lib/libiconv-full/include
+TARGET_LDFLAGS += \
+	-L$(STAGING_DIR)/usr/lib/libiconv-full/lib
+endif
+
 define Package/python-mysql/Default
   SUBMENU:=Python
   SECTION:=lang