configure.ac: use MbedTLS pkg-config if available #1455
Merged
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Newer MbedTLS versions provide pkg-config files for easier dependency management/linking, see the release notes of versions 3.6.0 and 2.28.8.
This PR allows the autoconf build script to utilize the mbedtls pkg-config file if it exists, falling back to the previous method of finding MbedTLS if no pkg-config file was found.
Additionally, this change allows overriding
MbedTLS_CFLAGS
andMbedTLS_LIBS
, which was previously not possible (unlike all the other DTLS libraries).