configure: Fixed inclusion of krb5 when CURL_DISABLE_CRYPTO_AUTH is defined

Commit fe0f8967 fixed a problem with krb5 not being defined as a
supported feature when HAVE_GSSAPI is defined, however, it should
only be included if CURL_DISABLE_CRYPTO_AUTH is not set, like when
SPNEGO is listed as a feature.

configure.ac

@@ -3354,7 +3354,7 @@ if test "x$USE_WINDOWS_SSPI" = "x1"; then
 fi
 
 if test "x$HAVE_GSSAPI" = "x1"; then
-  SUPPORT_FEATURES="$SUPPORT_FEATURES GSS-API krb5"
+  SUPPORT_FEATURES="$SUPPORT_FEATURES GSS-API"
 fi
 
 if test "x$CURL_DISABLE_CRYPTO_AUTH" != "x1" -a \
@@ -3363,7 +3363,7 @@ if test "x$CURL_DISABLE_CRYPTO_AUTH" != "x1" -a \
 fi
 
 if test "x$CURL_DISABLE_CRYPTO_AUTH" != "x1" -a \
-    \( "x$USE_WINDOWS_SSPI" = "x1" \); then
+    \( "x$HAVE_GSSAPI" = "x1" -o "x$USE_WINDOWS_SSPI" = "x1" \); then
   SUPPORT_FEATURES="$SUPPORT_FEATURES krb5"
 fi