Adding Mac triplet

Python should be a dylib now

Scripts/Triplets/x64-osx.cmake

@@ -0,0 +1,26 @@
+set(VCPKG_TARGET_ARCHITECTURE x64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_DISABLE_COMPILER_TRACKING TRUE)
+
+set(VCPKG_CMAKE_SYSTEM_NAME Darwin)
+set(VCPKG_OSX_ARCHITECTURES x86_64)
+
+# Unfortunately, we cannot include() anything from here because CMAKE_CURRENT_LIST_DIR is "wrong."
+# If you update this list, remember to synchronize x86-windows-plasma.cmake.
+set(_PLASMA_DYNAMIC_LIBRARIES
+    cairo
+    python2
+    python3
+)
+
+cmake_policy(SET CMP0057 NEW)
+if(PORT IN_LIST _PLASMA_DYNAMIC_LIBRARIES)
+    set(VCPKG_LIBRARY_LINKAGE dynamic)
+else()
+    set(VCPKG_LIBRARY_LINKAGE static)
+endif()
+
+# This is a terrible hack because meson seems to suck.
+if(PORT STREQUAL cairo)
+    set(VCPKG_BUILD_TYPE release)
+endif()