tests: add new feature 'SSLpinning'

... and make test 2034 and 2035 require it, and have it set when built
with OpenSSL or GnuTLS.
diff --git a/tests/FILEFORMAT b/tests/FILEFORMAT
index e484272..9fd179e 100644
--- a/tests/FILEFORMAT
+++ b/tests/FILEFORMAT
@@ -213,6 +213,7 @@
 OpenSSL
 socks
 SSL
+SSLpinning
 TLS-SRP
 TrackMemory
 unittest
diff --git a/tests/data/test2034 b/tests/data/test2034
index 92f6085..965c9a1 100644
--- a/tests/data/test2034
+++ b/tests/data/test2034
@@ -25,6 +25,7 @@
 <client>
 <features>
 SSL
+SSLpinning
 </features>
 <server>
 https Server-localhost-sv.pem
diff --git a/tests/data/test2035 b/tests/data/test2035
index 8591be2..64282fa 100644
--- a/tests/data/test2035
+++ b/tests/data/test2035
@@ -17,6 +17,7 @@
 <client>
 <features>
 SSL
+SSLpinning
 </features>
 <server>
 https Server-localhost-sv.pem
diff --git a/tests/runtests.pl b/tests/runtests.pl
index f52678c..8802c0c 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -224,6 +224,8 @@
 my $has_winssl;   # built with WinSSL    (Secure Channel aka Schannel)
 my $has_darwinssl;# build with DarwinSSL (Secure Transport)
 
+my $has_sslpinning; # built with a TLS backend that supports pinning
+
 my $has_shared = "unknown";  # built shared
 
 my $resolver;     # string to hold the resolver backend
@@ -2299,10 +2301,12 @@
            }
            elsif ($libcurl =~ /openssl/i) {
                $has_openssl=1;
+               $has_sslpinning=1;
                $ssllib="OpenSSL";
            }
            elsif ($libcurl =~ /gnutls/i) {
                $has_gnutls=1;
+               $has_sslpinning=1;
                $ssllib="GnuTLS";
            }
            elsif ($libcurl =~ /nss/i) {
@@ -2758,6 +2762,11 @@
                     next;
                 }
             }
+            elsif($1 eq "SSLpinning") {
+                if($has_sslpinning) {
+                    next;
+                }
+            }
             elsif($1 eq "OpenSSL") {
                 if($has_openssl) {
                     next;