github: Always build OpenSSL with SRP support

The special handling caused a significant diff between builds with and
without LD, which made ccache less effective as we only store the cache
once for the build without LD.

However, despite this change, while it previously was the case that the
LD vs. non-LD builds didn't differ much, that's not the case anymore
nowadays.  In particular the --disable-asan option and the BFD-based
backtraces for the native OpenSSL builds (e.g. default or openssl-sys)
cause quite a significant diff.  As cache storage is limited, we keep
the current behavior for now.  But it might be an option to reduce or
even remove the LD builds in the future as ASAN seems do the job pretty
well and we still use LD in the testing environment.

scripts/test.sh

@@ -104,17 +104,6 @@ build_openssl()
 		return
 	fi
 
-	if test "$LEAK_DETECTIVE" = "yes"; then
-		# insist on compiling with gcc and debug information as symbols are
-		# otherwise not found, but we can disable SRP (see below)
-		SSL_OPT="$SSL_OPT no-srp CC=gcc -d"
-	elif test "$CC" != "clang"; then
-		# when using ASan with clang, llvm-symbolizer is used to resolve symbols
-		# and this tool links libcurl, which in turn requires SRP, so we can
-		# only disable it when not building with clang
-		SSL_OPT="$SSL_OPT no-srp"
-	fi
-
 	echo "$ build_openssl()"
 
 	git clone https://github.com/openssl/openssl.git --depth 1 -b $SSL_REV $SSL_DIR || exit $?