Update CMake deployment target to 10.5 (#9)

* Update CMake deployment target to 10.5

Fixes MonoGame/MonoGame#9013

* Disable Brotli in CMake build arguments

Updated CMake arguments to disable Brotli during build.

Author: dellis1972

build/BuildMacOSTask.cs

@@ -16,7 +16,7 @@ public override void Run(BuildContext context)
         // Build
         var buildDir = "freetype/build";
         context.CreateDirectory(buildDir);
-        context.StartProcess("cmake", new ProcessSettings { WorkingDirectory = buildDir, Arguments = "../ -DBUILD_SHARED_LIBS=true -DCMAKE_OSX_DEPLOYMENT_TARGET=13.0 -DFT_DISABLE_HARFBUZZ=TRUE -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES=\"x86_64;arm64\"" });
+        context.StartProcess("cmake", new ProcessSettings { WorkingDirectory = buildDir, Arguments = "../ -DBUILD_SHARED_LIBS=true -DCMAKE_OSX_DEPLOYMENT_TARGET=10.5 -DFT_DISABLE_BROTLI=TRUE -DFT_DISABLE_HARFBUZZ=TRUE -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES=\"x86_64;arm64\"" });
         context.StartProcess("make", new ProcessSettings { WorkingDirectory = buildDir });
 
         foreach (var filePath in Directory.GetFiles("freetype/build"))