Add a mozconfig file which can be used to make building thunderbird easier

mail/config/mozconfig

@@ -0,0 +1,22 @@
+
+# This file specifies the build flags for Thunderbird.  You can use it by adding:
+#  . $topsrcdir/mail/config/mozconfig
+# to the top of your mozconfig file.
+
+export MOZ_THUNDERBIRD=1
+mk_add_options MOZ_THUNDERBIRD=1
+
+ac_add_options --enable-crypto
+ac_add_options --disable-mathml
+ac_add_options --disable-installer
+ac_add_options --disable-activex
+ac_add_options --disable-activex-scripting
+ac_add_options --disable-tests
+ac_add_options --disable-oji
+ac_add_options --disable-necko-disk-cache
+ac_add_options --disable-profilesharing
+ac_add_options --enable-extensions=wallet,spellcheck,xmlextras
+ac_add_options --enable-necko-protocols=http,file,jar,viewsource,res,data
+
+# Note: Only include icon for mac, windows and os2
+ac_add_options --enable-image-decoders=icon,png,gif,jpeg,bmp