[MKISOFS] Fix Clang check for macOS platforms

On macOS, CMAKE_C_COMPILER_ID is "AppleClang". While certainly Clang,
this does not match the exact string "Clang" that is being checked for,
and as a result the warning flags guarded thereby are not passed to the
compiler. With this change CMake will recognize both Clang and AppleClang.

sdk/tools/mkisofs/CMakeLists.txt

@@ -107,7 +107,7 @@ else()
  # Silence compilers checking for invalid formatting sequences.
  target_compile_options(libschily PRIVATE "-Wno-format")
 
- if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "15")
+ if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "15")
  # mkisofs uses K&R-style function definitions to support very old compilers.
  # This causes warnings with modern compilers.
  target_compile_options(libmdigest PRIVATE "-Wno-deprecated-non-prototype")