Get the Gnutls code compiling on Fedora 30
The recent changes caused the build to fail on Fedora 30 when built with --enable-gcc-warnings, among other things with diagnostics that gnutls_compression_get and gnutls_compression_get_name are deprecated (this started with GnuTLS 3.6). Fix this by refusing to call these obsolescent and now-dummy functions in GnuTLS 3.6 and later. However, this is just a temporary workaround to get the build working; a real fix is needed, as network-stream-tests fail. * src/gnutls.c (HAVE_GNUTLS_COMPRESSION_GET): New macro. (gnutls_compression_get, gnutls_compression_get_name): Define only if HAVE_GNUTLS_COMPRESSION_GET. (init_gnutls_functions): Load the two functions only if HAVE_GNUTLS_COMPRESSION_GET. (emacs_gnutls_certificate_export_pem): Use alloca instead of xmalloc. (Fgnutls_peer_status): Just return "NULL" if the functions are deprecated. (Fgnutls_format_certificate): Fix pointer signedness glitches. * src/process.c: Fix spacing.
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