cleanup jextract options.
1. Change -d option for output to be --output
2. Introduce -D option to pass preprocessor macro
3. Remove -C option. Support compile_flags.txt file like clang tools do to pass clang specific options to jextract.
1. Change -d option for output to be --output
2. Introduce -D option to pass preprocessor macro
3. Remove -C option. Support compile_flags.txt file like clang tools do to pass clang specific options to jextract.