pcre: compile jit by default if available.

configure.in

@@ -300,16 +300,13 @@ AC_INIT(configure.in)
    fi
 
     #enable support for PCRE-jit available since pcre-8.20
-    AC_ARG_ENABLE(pcre-jit,
-           AS_HELP_STRING([--enable-pcre-jit], [Enable experimental support for PCRE-jit]),,[enable_pcre_jit=no])
-    AS_IF([test "x$enable_pcre_jit" = "xyes"], [
     AC_MSG_CHECKING(for PCRE JIT support)
     AC_TRY_COMPILE([ #include <pcre.h> ],
         [
         int jit = 0;
         pcre_config(PCRE_CONFIG_JIT, &jit);
         ],
-            [ pcre_jit_available=yes ], [:]
+        [ pcre_jit_available=yes ], [ pcre_jit_available=no ]
         )
 
     if test "x$pcre_jit_available" = "xyes"; then
@@ -346,16 +343,7 @@ AC_INIT(configure.in)
        else
            AC_MSG_RESULT(yes)
        fi
-        else
-            AC_MSG_RESULT(no)
-            echo
-            echo "   Error! --enable-pcre-jit set but PCRE_CONFIG_JIT not found"
-            echo "   Make sure your PCRE supports JIT. Version 8.20+ with"
-            echo "   --enable-jit passed to it's configure script."
-            echo
-            exit 1
     fi
-    ])
 
 #libyaml
     AC_ARG_WITH(libyaml_includes,
@@ -1086,5 +1074,5 @@ Suricata Configuration:
   GCC Profile enabled:      ${enable_gccprofile}
   Old barnyard2 support:    ${enable_old_barnyard2}
   Non-bundled htp:          ${enable_non_bundled_htp}
-  PCRE jit:                 ${enable_pcre_jit}
+  PCRE jit:                 ${pcre_jit_available}
 "