mozcoreconf-v4.eclass: drop configure options for js-ultrasparc

Sparc support has stopped upstream long ago, and mozilla packages in gentoo
have dropped the sparc keyword long ago as well.

eclass/mozcoreconf-v4.eclass

@@ -227,11 +227,6 @@ mozconfig_init() {
  --disable-strip \
  --disable-install-strip
 
- # Here is a strange one...
- if is-flag '-mcpu=ultrasparc*' || is-flag '-mtune=ultrasparc*'; then
- mozconfig_annotate "building on ultrasparc" --enable-js-ultrasparc
- fi
-
  # jemalloc won't build with older glibc
  ! has_version ">=sys-libs/glibc-2.4" && mozconfig_annotate "we have old glibc" --disable-jemalloc
 }