Disable code coverage in Release for Carthage. Fixes #256

RNCryptor.xcodeproj/project.pbxproj

@@ -504,6 +504,7 @@
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_CODE_COVERAGE = NO;
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;