libssh: update to 0.8.3.

Also enable UNIT_TESTING:

100% tests passed, 0 tests failed out of 24

Total Test time (real) =  16.15 sec

srcpkgs/libssh/template

@@ -1,8 +1,9 @@
 # Template file for 'libssh'
 pkgname=libssh
-version=0.8.2
+version=0.8.3
 revision=1
 build_style=cmake
+configure_args="-DUNIT_TESTING=ON"
 hostmakedepends="pkg-config python3"
 makedepends="zlib-devel libressl-devel cmocka-devel"
 short_desc="Multiplatform C library implementing the SSH v2 protocol"
@@ -10,7 +11,7 @@ maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="LGPL-2.1-or-later"
 homepage="https://www.libssh.org/"
 distfiles="https://git.libssh.org/projects/libssh.git/snapshot/${pkgname}-${version}.tar.bz2"
-checksum=1f5bb2c64a757a11959c22556493c6e31ea17aacd7d61e6e181692cca05686c2
+checksum=a26886f725f75a9b0a38eb32f3b4778a8d153cfafc530bfa8322909074343c76
 
 case "$XBPS_TARGET_MACHINE" in
 	*-musl) configure_args="-DHAVE_GLOB=0" ;;