This change also removes all wget_thread_* functionality from libwget.
Since gnulib also switched to relying on C11, there is no way we can stay
with a lower C standard. This is how it is.
* include/wget/wget.h: Add WGET_SSL_REPORT_INVALID_CERT macro
* libwget/ssl_gnutls.c: Change certificate related error_printf() calls, for error_printf_check()
* libwget/ssl_openssl.c: Consider the case WGET_SSL_REPORT_INVALID_CERT in wget_ssl_set_config_int()
* libwget/ssl_wolfssl.c: Change certificate related error_printf() calls, for error_printf_check()
* src/options.c: Admit quiet as a valid value on --check-certificate
* src/wget_options.h: Move check_certificate from bool to an enum type (with enabled, disabled and log_disabled as values)
* include/wget/wget.h: Remove function wget_iri_isunreserved_path().
* libwget/iri.c: Remove function wget_iri_isunreserved_path().
(iri_ctype): Extend array with unreserved characters.
(wget_iri_isunreserved): Simplify code.
(wget_iri_escape): Use macro iri_isunreserved instead of wget_iri_isunreserved().
(wget_iri_escape_path): Add RFC links to function comment,
Fix check whether char needs percent-encoding or not,
Use macro iri_isunreserved instead of wget_iri_isunreserved().
* include/wget/wget.h: Set return type of wget_strmemcpy to size_t.
* libwget/mem.c (wget_strmemcpy): Return length of destination string.
* unit-tests/test.c: Amend tests of wget_strmemcpy.
* include/wget/wget.h: Make metalink->iri 'const'
* libwget/metalink.c (add_mirror): Code cleanup
* src/wget.c (establish_connection): Skip HTTP mirrors if HTTPS requested,
(queue_url_from_local): Lock mutex a bit later
* include/wget/wget.h (wget_tls_stats_data): Change type of tfo and false_start to bool
* libwget/ssl_gnutls.c: Use bool in _session_context,
remove use of !!
* include/wget/wget.h: Likewise
* libwget/net.c: Likewise
* libwget/init.c (wget_global_init): Fix param type to wget_tcp_set_tcp_fastopen()
* src/wget_options.h (struct config): Change type of tcp_fastopen to bool
* include/wget/wget.h: Change param to bool in wget_hsts_db_add_fn(),
(struct wget_http_response_st): Use bool for hsts_include_subdomains and keep_alive,
change param to bool in wget_http_parse_strict_transport_security(),
change param to bool in wget_http_parse_connection()
* libwget/hsts.c: change param to bool in new_hsts(),
change param to bool in wget_hsts_db_add()
* libwget/http_parse.c: change param to bool in wget_http_parse_strict_transport_security(),
change param to bool in wget_http_parse_connection()
* tests/test-plugin-dummy.c: change param to bool in test_hsts_db_add()
* unit-tests/test.c (test_hsts): Change type of include_subdomains to bool
* include/wget/wget.h: Change second param of wget_cookie_set_keep_session_cookies() to bool
* libwget/cookie.c: Likewise
* libwget/init.c (struct _CONFIG): Use bool for cookies_enabled, keep_session_cookies
* include/wget/wget.h: Change param for wget_hash_init(),
change param and return type for wget_hash_deinit()
* libwget/hashfile.c: Rewrite hashing functions for WITH_LIBWOLFCRYPT
* unit-tests/test.c: Add tests for incremental hashing
* include/wget/wget.h: Introduce WGET_E_IO
* libwget/error.c: Add WGET_E_IO to wget_strerror()
* libwget/hashfile.c: Make use of WGET_E_IO
* libwget/io.c: Likewise
* configure.ac: Add -Wno-nullability-extension -Wno-nullability-completeness to WARN_CFLAGS
* include/wget/wget.h: Add CLANG_VERSION_AT_LEAST,
fix attribute defines for clang,
make use of attributes by using static inline functions for wget allocation,
define NULLABLE for clang
* libwget/xalloc.c: Rename wget allocation function pointers
* src/options.c: Likewise
* unit-tests/test.c: Likewise
