Cleanup configures pcre sljit test.

configure.in

@@ -294,32 +294,33 @@ AC_INIT(configure.in)
     AC_ARG_ENABLE(pcre-sljit,
            AS_HELP_STRING([--enable-pcre-sljit], [Enable experimental support for PCRE-sljit]),,[enable_pcre_sljit=no])
     AS_IF([test "x$enable_pcre_sljit" = "xyes"], [
-           AC_MSG_CHECKING(for PCRE sljit support)
-           AC_TRY_COMPILE([ #include <pcre.h> ],
-             [ const char* regexstr = "(a|b|c|d)";
-             pcre *re;
-             const char *error;
-             pcre_extra *extra;
-             int err_offset;
-             re = pcre_compile(regexstr,0, &error, &err_offset,NULL);
-             extra = pcre_study(re, PCRE_STUDY_JIT_COMPILE, &error);
-             if (!(extra->flags & PCRE_EXTRA_EXECUTABLE_FUNC)) {
-                 printf("\nJIT compiler does not support: %s\n", regexstr);
-             }
-             return 0;],
-           [ pcre_sljit_available=yes ], [:]
-           )
-           if test "$pcre_sljit_available" = "yes"; then
-            AC_MSG_RESULT(yes)
-            CFLAGS="${CFLAGS} -D_PCRE_HAVE_SLJIT"
+        AC_MSG_CHECKING(for PCRE sljit support)
+        AC_TRY_COMPILE([ #include <pcre.h> ],
+            [ const char* regexstr = "(a|b|c|d)";
+              pcre *re;
+              const char *error;
+              pcre_extra *extra;
+              int err_offset;
+              re = pcre_compile(regexstr,0, &error, &err_offset,NULL);
+              extra = pcre_study(re, PCRE_STUDY_JIT_COMPILE, &error);
+              if (!(extra->flags & PCRE_EXTRA_EXECUTABLE_FUNC)) {
+                  printf("\nJIT compiler does not support: %s\n", regexstr);
+              }
+              return 0;],
+            [ pcre_sljit_available=yes ], [:]
+            )
+
+           if test "x$pcre_sljit_available" = "xyes"; then
+               AC_MSG_RESULT(yes)
+               AC_DEFINE([PCRE_HAVE_SLJIT], [1], [Pcre with JIT compiler support enabled])
            else
-            AC_MSG_RESULT(no)
-            echo
-            echo "   Error! --enable-pcre-sljit set but PCRE_STUDY_JIT_COMPILE not found"
-            echo "   Make sure you use pcre found here "
-            echo "   http://sljit.sourceforge.net/pcre.html"
-            echo
-            exit 1
+               AC_MSG_RESULT(no)
+               echo
+               echo "   Error! --enable-pcre-sljit set but PCRE_STUDY_JIT_COMPILE not found"
+               echo "   Make sure you use pcre found here "
+               echo "   http://sljit.sourceforge.net/pcre.html"
+               echo
+               exit 1
            fi
 
     ])