Add gflags to projects that need it only

src/xenia/app/premake5.lua

@@ -32,6 +32,7 @@ project("xenia-app")
   })
   includedirs({
     project_root.."/third_party/elemental-forms/src",
+	project_root.."/build_tools/third_party/gflags/src",
   })
   local_platform_files()
   files({
@@ -52,6 +53,8 @@ project("xenia-app")
       "xenia-hid-winkey",
       "xenia-hid-xinput",
     })
+
+--[[
   filter("configurations:Checked")
     local libav_root = "../third_party/libav-xma-bin/lib/Debug"
     linkoptions({
@@ -64,6 +67,7 @@ project("xenia-app")
       libav_root.."/libavcodec.a",
       libav_root.."/libavutil.a",
     })
+]]
 
   filter("platforms:Windows")
     -- Only create the .user file if it doesn't already exist.