Fix for Solaris.

This should be investigated for sending upstream.

--- a/mail/installer/Makefile.in Fri Apr 12 10:02:00 2013

+++ b/mail/installer/Makefile.in Fri Apr 12 10:02:20 2013

@@ -16,7 +16,7 @@

MOZ_PKG_MANIFEST_P = $(srcdir)/package-manifest.in

# Some files have been already bundled with xulrunner

ifndef SYSTEM_LIBXUL

-MOZ_PKG_FATAL_WARNINGS = 1

+# MOZ_PKG_FATAL_WARNINGS = 1

endif

MOZ_NONLOCALIZED_PKG_LIST = \