cmake: Fix building against libiconv

packages/mariadb/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://mariadb.org
 TERMUX_PKG_DESCRIPTION="A drop-in replacement for mysql server"
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_VERSION=10.3.14
-TERMUX_PKG_REVISION=4
+TERMUX_PKG_REVISION=5
 TERMUX_PKG_SHA256=ba1c94d92fc8ebdf9b8a1d1b93ed6aeeead33da507efbbd4afcf49f32023e054
 TERMUX_PKG_SRCURL=https://ftp.osuosl.org/pub/mariadb/mariadb-$TERMUX_PKG_VERSION/source/mariadb-$TERMUX_PKG_VERSION.tar.gz
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="

packages/mariadb/libmariadb-libmariadb-CMakeLists.txt.patch

@@ -0,0 +1,11 @@
+diff -u -r ../mariadb-10.3.14/libmariadb/libmariadb/CMakeLists.txt ./libmariadb/libmariadb/CMakeLists.txt
+--- ../mariadb-10.3.14/libmariadb/libmariadb/CMakeLists.txt	2019-04-01 14:03:57.000000000 +0000
++++ ./libmariadb/libmariadb/CMakeLists.txt	2019-05-22 23:50:06.105346983 +0000
+@@ -302,7 +302,6 @@
+   IF(ICONV_INCLUDE_DIR)
+      INCLUDE_DIRECTORIES(BEFORE ${ICONV_INCLUDE_DIR}) 
+   ENDIF()
+-  ADD_DEFINITIONS(-DLIBICONV_PLUG)
+ ENDIF()
+ 
+ IF(ZLIB_FOUND AND WITH_EXTERNAL_ZLIB)