Contribution to the Pelles C Module

My name is Charlie Lin, and I intend to contribute and maintain support for the Pelles C toolchain.

@clin1234 thanks! To get started, please open an entry in the CMake Issue Tracker titled “Pelles C toolchain support” and include in the description a link to the toolchain’s homepage. Please also read CONTRIBUTING.rst from the top of the source tree.

The first step will be to add a compiler id for the toolchain and detect it via its predefined macros. For that, see Modules/CMakeCompilerIdDetection.cmake for where to hook in and Modules/Compiler/*-DetermineCompiler.cmake for examples.

I see CMake Issue 21536, thanks.