Merge branch 'configure-args-compression' into 'master'

configure.ac: fix brotli/zstd configure argument name; fix zstd searching

Closes #1342 and #1343

See merge request gnutls/gnutls!1557

diff --cc NEWS
index 1d1ff9731483bd5caee684c99cc04c96b3b20145,0f3b18311e5c2ad0bd01a7b4e6f96ecc0c5c404d..32b1e0dd2c1d6866c77d08f3653e6dd424d08f7b
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -5,33 -5,28 +5,42 @@@ Copyright (C) 2000-2016 Free Software F
  Copyright (C) 2013-2019 Nikos Mavrogiannopoulos
  See the end for copying conditions.
  
+ * Version ?.?.? (released ????-??-??)
+ 
+ ** The configure arguments for Brotli and Zstandard (zstd) support
+    have changed to reflect the previous help text: they are now
+    --with-brotli/--with-zstd respectively (#1342).
+ 
+ ** Detecting the Zstandard (zstd) library in configure has been
+    fixed (#1343).
+ 
  * Version 3.7.4 (released 2022-03-17)
  
 -** libgnutls: Added support for certificate compression as defined in RFC8879.
 -** certtool: Added option --compress-cert that allows user to specify compression
 -   methods for certificate compression.
 +** libgnutls: Added support for certificate compression as defined in RFC8879
 +   (#1301). New API functions (gnutls_compress_certificate_get_selected_method
 +   and gnutls_compress_certificate_set_methods) allow client and server to set
 +   their preferences.
 +
 +** certtool: Added option --compress-cert that allows user to specify
 +   compression methods for certificate compression.
 +
  ** libgnutls: GnuTLS can now be compiled with --enable-strict-x509 configure
 -   option to enforce stricter certificate sanity checks that are compliant
 -   with RFC5280.
 +   option to enforce stricter certificate sanity checks that are compliant with
 +   RFC5280.
 +
  ** libgnutls: Removed IA5String type from DirectoryString within issuer
     and subject name to make DirectoryString RFC5280 compliant.
 -** libgnutls: Added function to retrieve the name of current ciphersuite
 -   from session (#1291).
  
 +** libgnutls: Added function (gnutls_record_send_file) to send file content from
 +   open file descriptor (!1486). The implementation is optimized if KTLS (kernel
 +   TLS) is enabled.
 +
 +** libgnutls: Added function (gnutls_ciphersuite_get) to retrieve the name of
 +   current ciphersuite from TLS session (#1291).
 +
 +** libgnutls: The run-time dependency on tpm2-tss is now re-implemented using
 +   dlopen, so GnuTLS does not indirectly link to other crypto libraries until
 +   TPM2 functionality is utilized (!1544).
  
  ** API and ABI modifications:
  GNUTLS_COMP_BROTLI: New gnutls_compression_method_t enum member