We don't build standalone TIFF support on Apple platforms

The ImageIO framework has support for TIFF images across all versions of macOS and iOS.

Author: slouken

Xcode/SDL_image.xcodeproj/project.pbxproj

@@ -624,7 +624,6 @@
 					LOAD_QOI,
 					LOAD_SVG,
 					LOAD_TGA,
-					LOAD_TIF,
 					LOAD_XCF,
 					LOAD_XPM,
 					LOAD_XV,
@@ -690,7 +689,6 @@
 					LOAD_QOI,
 					LOAD_SVG,
 					LOAD_TGA,
-					LOAD_TIF,
 					LOAD_XCF,
 					LOAD_XPM,
 					LOAD_XV,