Bug 26650: Bump fxc2 to update d3dcompiler_47.dll

projects/fxc2/config

 # vim: filetype=yaml sw=2
 version: '[% c("abbrev") %]'
 git_url: https://github.com/mozilla/fxc2.git
-git_hash: 5ace4c25b63cb5a83b58a3eae3d36256a6022cde
+git_hash: 358978f779e250d19afec50a4d705a11a7efc24c
 filename: '[% project %]-[% c("version") %]-[% c("var/build_id") %].tar.gz'
 container:
   use_container: 1