add more deps for mingw, shorten cmds a bit

.travis.yml

@@ -150,9 +150,9 @@ before_install:
     export MSYS2+='& C:\\tools\\msys64\\msys2_shell.cmd -defterm -no-start'
     export MINGW64="$MSYS2 -mingw64 -full-path -here -c "\"\$@"\" --"
     export MSYS2+=" -msys2 -c "\"\$@"\" --"
-    $MSYS2 pacman --sync --noconfirm --needed mingw-w64-x86_64-toolchain
+    $MSYS2 pacman -Sy --noconfirm --needed mingw-w64-x86_64-toolchain
     ## Install more MSYS2 packages from https://packages.msys2.org/base here
-    $MSYS2 pacman --sync --noconfirm --needed make mingw-w64-x86_64-SDL mingw-w64-x86_64-SDL_gfx mingw-w64-x86_64-SDL_mixer mingw-w64-x86_64-SDL_ttf
+    $MSYS2 pacman -Sy --noconfirm --needed autoconf automake-wrapper make mingw-w64-x86_64-SDL mingw-w64-x86_64-SDL_gfx mingw-w64-x86_64-SDL_mixer mingw-w64-x86_64-SDL_ttf
     $MSYS2 sed -i 's/<SDL.h>/"SDL.h"/' /mingw64/include/SDL/SDL_gfxPrimitives.h # otherwise header can't be located
     
     taskkill //IM gpg-agent.exe //F  # https://travis-ci.community/t/4967