polarssl_threadlock: remove conditionally unused code
Make functions no-ops if neither both USE_THREADS_POSIX and HAVE_PTHREAD_H nor both USE_THREADS_WIN32 and HAVE_PROCESS_H are defined. Previously, if only one of them was defined, there was either code compiled that did nothing useful or the wrong header included for the functions used. Also, move POLARSSL_MUTEX_T define to implementation file as it's not used externally. Closes https://github.com/curl/curl/pull/3739
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