enable librsvg2 for SVG format icon

[hideyukn88]

enable librsvg2 for SVG format icon.

[seflerZ]

This will not show your SVG icons in WSLg because the weston runtime has hard coded the icon path in /rpdrail-shell/app-list.c as the following code shows:

char *icon_folder[] = {
	"/usr/share/pixmaps/",
	"/usr/share/icons/hicolor/96x96/apps/",
	"/usr/share/icons/hicolor/128x128/apps/",
	"/usr/share/icons/hicolor/48x48/apps/",
	"/usr/share/icons/hicolor/32x32/apps/",
	"/usr/share/icons/hicolor/24x24/apps/",
	"/usr/share/icons/hicolor/22x22/apps/",
	"/usr/share/icons/hicolor/16x16/apps/",
	"/usr/share/icons/HighContrast/96x96/apps/",
	"/usr/share/icons/HighContrast/128x128/apps/",
	"/usr/share/icons/HighContrast/48x48/apps/",
	"/usr/share/icons/HighContrast/32x32/apps/",
	"/usr/share/icons/HighContrast/24x24/apps/",
	"/usr/share/icons/HighContrast/22x22/apps/",
	"/usr/share/icons/HighContrast/16x16/apps/",
	"/usr/share/icons/hicolor/scalable/apps/", /* use scalable(= svg) only when no png. */
	"/usr/share/icons/HighContrast/scalable/apps/", /* use scalable (= svg) only when no png. */
};

But you can change the source code and recompile it. Once you did that, the SVG icon will display. So this PR only add missing runtime libs.

[hideyukn88]

This will not show your SVG icons in WSLg because the weston runtime has hard coded the icon path in /rpdrail-shell/app-list.c as the following code shows:

char *icon_folder[] = {
	"/usr/share/pixmaps/",
	"/usr/share/icons/hicolor/96x96/apps/",
	"/usr/share/icons/hicolor/128x128/apps/",
	"/usr/share/icons/hicolor/48x48/apps/",
	"/usr/share/icons/hicolor/32x32/apps/",
	"/usr/share/icons/hicolor/24x24/apps/",
	"/usr/share/icons/hicolor/22x22/apps/",
	"/usr/share/icons/hicolor/16x16/apps/",
	"/usr/share/icons/HighContrast/96x96/apps/",
	"/usr/share/icons/HighContrast/128x128/apps/",
	"/usr/share/icons/HighContrast/48x48/apps/",
	"/usr/share/icons/HighContrast/32x32/apps/",
	"/usr/share/icons/HighContrast/24x24/apps/",
	"/usr/share/icons/HighContrast/22x22/apps/",
	"/usr/share/icons/HighContrast/16x16/apps/",
	"/usr/share/icons/hicolor/scalable/apps/", /* use scalable(= svg) only when no png. */
	"/usr/share/icons/HighContrast/scalable/apps/", /* use scalable (= svg) only when no png. */
};

But you can change the source code and recompile it. Once you did that, the SVG icon will display. So this PR only add missing runtime libs.

The whole purpose of this is PR is to add SVG decoder library to the project.