SPM define (#574)

* carthage update.

* build!

* cleanup Package.swift

* repair Xcode build.

* update makefile

* fixed podspec after SPM related changes. PIN xcode version on CI for Carthage and SPM jobs

* fixed Xcode SPM integration

* more Xcode integration work.

* wrap spm

* use pinterest/PINCache 3.0.2

* .define("PIN_WEBP", to: "1") for SPM

* .define("USE_PINCACHE", to: "1")

Package.swift

@@ -34,6 +34,9 @@ let package = Package(
                 .headerSearchPath("AnimatedImages"),
                 .headerSearchPath("ImageCategories"),
                 .headerSearchPath("PinCache"),
+
+                .define("USE_PINCACHE", to: "1"),
+                .define("PIN_WEBP", to: "1"),
                 ]),
     ]
 )