don't check for openssl libcrypto by default on Windows (#35)

1Conan/tsschecker uses winapi bcrypt for it's hashing functions so it is unnecessary for configure to check for openssl libcrypto on by default Windows.

configure.ac

@@ -45,13 +45,16 @@ CFLAGS+=" -D TSSCHECKER_VERSION_SHA=\\\"$(git rev-parse HEAD | tr -d '\n')\\\""
 # Checks for libraries.
 AC_ARG_WITH(
     [libcrypto],
-    [AS_HELP_STRING([--with-libcrypto], [build with libcrypto (default for non-Mac)])],
+    [AS_HELP_STRING([--with-libcrypto], [build with libcrypto (default for non-Mac/Windows)])],
     [],
     [
         case "${host_os}" in
             darwin*)
                 with_libcrypto=no
                 ;;
+            cygwin*|mingw*)
+                with_libcrypto=no
+                ;;
             *)
                 with_libcrypto=yes
                 ;;