Bug 1433517 - Prevent illegal characters in MOZ_MACBUNDLE_ID r=glandium

CFBundleIdentifiers can only contain [A-Za-z.-], and by convention
the app component is lowercase and does not contain '.'.

Make configure delete all characters other than [a-z-] when generating
MOZ_MACBUNDLE_ID from MOZ_APP_DISPLAYNAME.

old-configure.in

@@ -4304,7 +4304,7 @@ dnl Mac bundle identifier (based on MOZ_APP_DISPLAYNAME)
 # If the MOZ_MACBUNDLE_ID is defined in the configure.sh, use it
 # Otherwise, use MOZ_APP_DISPLAYNAME
 if test -z "$MOZ_MACBUNDLE_ID"; then
-   MOZ_MACBUNDLE_ID=`echo $MOZ_APP_DISPLAYNAME | tr 'A-Z' 'a-z' | tr -d '[[:blank:]]'`
+   MOZ_MACBUNDLE_ID=`echo $MOZ_APP_DISPLAYNAME | tr 'A-Z' 'a-z' | tr -dc 'a-z-'`
 fi
 MOZ_MACBUNDLE_ID=${MOZ_DISTRIBUTION_ID}.${MOZ_MACBUNDLE_ID}
 if test "$MOZ_DEBUG"; then