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gnutls: Fix build failure related to gnulib specific commit reference
Fix build failure caused by libtasn1 (a dependency of gnutls) bootstrap process that sets the gnulib git checkout to a specific commit ID. The commit ID must be present in the local checkout to succeed otherwise an error like "fatal: reference is not a tree: ". A depth of 500 was chosen as a compromise to make it likely that the commit will be present as long as libtasn1 pulls in a fairly recent version and cloning the whole gnulib repo which is quite large.
gnutls: Fix build failure due to newer required autoconf and cleanup
Fix a build failure for GNUTLS caused by GNUTLS requiring a minimum version of autoconf 2.71 but the fuzzer base image is Ubuntu 20 based which has 2.6x. Also fix some shellcheck identified warnings related to unquoted path variables.