www-client/firefox: drop unused USE-flag descriptions from metadata.xml

Package-Manager: portage-2.2.28

www-client/firefox/metadata.xml

@@ -17,7 +17,6 @@
 	<flag name="hwaccel">Use hardware-accelerated rendering</flag>
 	<flag name="jemalloc">Enable or disable jemalloc</flag>
 	<flag name="jemalloc3">Enable or disable jemalloc3 (forced-on when supported prior to 38.0)</flag>
-	<flag name="minimal">Prevent sdk and headers from being installed</flag>
 	<flag name="pgo">Add support for profile-guided optimization using gcc-4.5,
 		for faster binaries. This option will double the compile time.</flag>
 	<flag name="skia">Enable the SKIA engine for 2D rendering as an alternative to cairo</flag>
@@ -35,6 +34,5 @@
 		instead of bundled.</flag>
 	<flag name="system-sqlite">Use the system-wide <pkg>dev-db/sqlite</pkg>
 		installation with secure-delete enabled</flag>
-	<flag name="egl">Enable EGL provider</flag>
 </use>
 </pkgmetadata>