Preparing for axTLS. Actual SSL API functions are only stubbed.

Added axTLS to autotool files and glue code to misc other files.
axtls.h maps SSL API functions, but may change.
axtls.c is just a stub file and will definitely change.

configure.ac

@@ -140,7 +140,7 @@ AC_SUBST(PKGADD_VENDOR)
 
 dnl
 dnl initialize all the info variables
-    curl_ssl_msg="no      (--with-{ssl,gnutls,nss,polarssl} )"
+    curl_ssl_msg="no      (--with-{ssl,gnutls,nss,polarssl,axtls} )"
     curl_ssh_msg="no      (--with-libssh2)"
    curl_zlib_msg="no      (--with-zlib)"
    curl_krb4_msg="no      (--with-krb4*)"
@@ -156,6 +156,7 @@ curl_verbose_msg="enabled (--disable-verbose)"
   curl_ldaps_msg="no      (--enable-ldaps)"
    curl_rtsp_msg="no      (--enable-rtsp)"
    curl_rtmp_msg="no      (--with-librtmp)"
+    init_ssl_msg=${curl_ssl_msg}
 
 dnl
 dnl Save anything in $LIBS for later
@@ -1933,7 +1934,60 @@ if test "$OPENSSL_ENABLED" != "1" -a "$GNUTLS_ENABLED" != "1"; then
 
 fi dnl OPENSSL != 1 -a GNUTLS_ENABLED != 1
 
-if test "x$OPENSSL_ENABLED$GNUTLS_ENABLED$NSS_ENABLED$POLARSSL_ENABLED" = "x"; then
+OPT_AXTLS=off
+
+AC_ARG_WITH(axtls,dnl
+AC_HELP_STRING([--with-axtls=PATH],[Where to look for axTLS, PATH points to the axTLS installation (default: /usr/local/lib).  Ignored if another SSL engine is selected.])
+AC_HELP_STRING([--without-axtls], [disable axTLS]),
+  OPT_AXTLS=$withval)
+
+if test "$curl_ssl_msg" = "$init_ssl_msg"; then
+  if test X"$OPT_AXTLS" != Xno; then
+    dnl backup the pre-axtls variables
+    CLEANLDFLAGS="$LDFLAGS"
+    CLEANCPPFLAGS="$CPPFLAGS"
+    CLEANLIBS="$LIBS"
+
+    case "$OPT_AXTLS" in
+    yes)
+      dnl --with-axtls (without path) used
+      PREFIX_AXTLS=/usr/local/lib
+      LIB_AXTLS="$PREFIX_AXTLS"
+      ;;
+    off)
+      dnl no --with-axtls option given, just check default places
+      PREFIX_AXTLS=
+      ;;
+    *)
+      dnl check the given --with-axtls spot
+      PREFIX_AXTLS=$OPT_AXTLS
+      LIB_AXTLS="$PREFIX_AXTLS"
+      LDFLAGS="$LDFLAGS -L$LIB_AXTLS"
+      CPPFLAGS="$CPPFLAGS -I$PREFIX_AXTLS/ssl"
+      ;;
+    esac
+
+    AC_CHECK_LIB(axtls, ssl_version,[
+      LIBS="-laxtls $LIBS"
+      AC_DEFINE(USE_AXTLS, 1, [if axTLS is enabled])
+      AC_SUBST(USE_AXTLS, [1])
+      AXTLS_ENABLED=1
+      USE_AXTLS="yes"
+      curl_ssl_msg="enabled (axTLS)"
+
+
+      LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$LIB_AXTLS"
+      export LD_LIBRARY_PATH
+      AC_MSG_NOTICE([Added $LIB_AXTLS to LD_LIBRARY_PATH])
+      ],[
+      LDFLAGS="$CLEANLDFLAGS"
+      CPPFLAGS="$CLEANCPPFLAGS"
+      LIBS="$CLEANLIBS"
+    ])
+  fi
+fi
+
+if test "x$OPENSSL_ENABLED$GNUTLS_ENABLED$NSS_ENABLED$POLARSSL_ENABLED$AXTLS_ENABLED" = "x"; then
   AC_MSG_WARN([SSL disabled, you will not be able to use HTTPS, FTPS, NTLM and more.])
   AC_MSG_WARN([Use --with-ssl, --with-gnutls, --with-polarssl or --with-nss to address this.])
 else