Add wolfSSL support #261

Job	Run time
build (ubuntu-latest, -DWITH_OPENSSL=ON -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF)	1m 13s
build (ubuntu-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=ON -DWITH_GCRYPT=ON)	55s
build (ubuntu-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF)	56s
build (ubuntu-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF -DWITH_WOLFSSL=ON)	51s
build (ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchain-cross-mingw32-linux.cmake)	1m 14s
build (macos-latest, -DWITH_OPENSSL=ON -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF)	43s
build (macos-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=ON -DWITH_GCRYPT=ON)	39s
build (macos-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF)	59s
build (macos-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF -DWITH_WOLFSSL=ON)	41s
build (windows-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF)	5m 1s
build (windows-latest, -DWITH_OPENSSL=OFF -DWITH_GNUTLS=OFF -DWITH_GCRYPT=OFF -DWITH_WOLFSSL=ON)	5m 1s
	18m 13s

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