*WIP* Drop subtitles support in ffmpeg

Also remove postgis just in case

Author: GArik

travis_config.sh

@@ -77,7 +77,7 @@ if [ -n "$IS_OSX" ]; then
                 if (!$bottle_block && /^\s*bottle do$/) { $bottle_block=1; next; }
                 if ($bottle_block) { if (/^\s*end\s*$/) { $bottle_block=0} elsif (/^\s*sha256\s/) {$_=""} next; }
 if (/^\s*depends_on "(x264|x265|xvid|frei0r|rubberband|libvidstab)"$/) {$_=""; next;}
-                if (/^\s*--enable-(gpl|libx264|libx265|libxvid|frei0r|librubberband|libvidstab)$/) {$_=""; next;}
+                if (/^\s*--enable-(gpl|libx264|libx265|libxvid|frei0r|librubberband|libvidstab|libass)$/) {$_=""; next;}
                 ' <"$FF_FORMULA" >"$LFF_FORMULA"
             diff -u "$FF_FORMULA" "$LFF_FORMULA" || test $? -le 1
 
@@ -106,6 +106,11 @@ function pre_build {
     if [ -n "$CACHE_STAGE" ]; then
         ELAPSED_TIME=$(($(date +%s) - $TRAVIS_TIMER_START_TIME/10**9))
         echo "Elapsed time: "$(($ELAPSED_TIME/60))"m (${ELAPSED_TIME}s)"
+        # Drop redundant dependants to reduce package update overhead
+        local pkg
+        pkg=postgis; brew list $pkg > /dev/null && brew rm $pkg
+        pkg=libass;  brew list $pkg > /dev/null && brew rm $pkg
+
         brew update
         generate_ffmpeg_formula
         brew_add_local_bottles