configuring gopls to recognize C headers

It took me a while to figure out how to get gopls to recognize C headers that aren't on the system path. I finally found success by adding a CGO_CFLAGS environment variable to my shell, which has -I<header path>

For example, I have whisper.cpp in ~/code/tmp/whisper.cpp, and I need to include headers from both /include and /ggml/include in that directory, so I created an environment variable:

CGO_CFLAGS="-I/Users/llimllib/code/tmp/whisper.cpp/include -I/Users/llimllib/code/tmp/whisper.cpp/ggml/include"