package/flutter-pi: add an option to enable the charset converter plugin

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
[yann.morin.1998@free.fr:
  - move plugin description, from commit log, to help text
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/flutter-pi/Config.in

@@ -23,6 +23,17 @@ if BR2_PACKAGE_FLUTTER_PI
 
 comment "plugins"
 
+config BR2_PACKAGE_FLUTTER_PI_CHARSET_CONVERTER_PLUGIN
+	bool "charset converter"
+	help
+	  Adds platform-side implementation of charset_converter plugin.
+
+	  Encode and decode charsets using platform built-in converter.
+	  This plugin saves app package size as you don't need external
+	  charset maps or whole libraries like iconv.
+
+	  https://pub.dev/packages/charset_converter
+
 config BR2_PACKAGE_FLUTTER_PI_GSTREAMER_AUDIO_PLAYER_PLUGIN
 	bool "gstreamer audio player"
 	depends on BR2_PACKAGE_HAS_LIBGLES

package/flutter-pi/flutter-pi.mk

@@ -27,7 +27,6 @@ FLUTTER_PI_CONF_OPTS = \
 	-DENABLE_VULKAN=OFF \
 	-DFILESYSTEM_LAYOUT=meta-flutter \
 	-DLINT_EGL_HEADERS=OFF \
-	-DBUILD_CHARSET_CONVERTER_PLUGIN=OFF \
 	-DTRY_BUILD_GSTREAMER_AUDIO_PLAYER_PLUGIN=OFF \
 	-DTRY_BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN=OFF \
 	-DTRY_ENABLE_OPENGL=OFF \
@@ -43,6 +42,12 @@ else
 FLUTTER_PI_CONF_OPTS += -DLTO=OFF
 endif
 
+ifeq ($(BR2_PACKAGE_FLUTTER_PI_CHARSET_CONVERTER_PLUGIN),y)
+FLUTTER_PI_CONF_OPTS += -DBUILD_CHARSET_CONVERTER_PLUGIN=ON
+else
+FLUTTER_PI_CONF_OPTS += -DBUILD_CHARSET_CONVERTER_PLUGIN=OFF
+endif
+
 ifeq ($(BR2_PACKAGE_FLUTTER_PI_GSTREAMER_AUDIO_PLAYER_PLUGIN),y)
 FLUTTER_PI_DEPENDENCIES += gstreamer1 gst1-plugins-base
 FLUTTER_PI_CONF_OPTS += -DBUILD_GSTREAMER_AUDIO_PLAYER_PLUGIN=ON