gallium: Use debug_get_bool_option for controlling assert failure behaviour.

Add
  GALLIUM_ABORT_ON_ASSERT=no
to C:\gallium.cfg instead.

src/gallium/auxiliary/util/p_debug.c

@@ -200,6 +200,8 @@ debug_get_bool_option(const char *name, boolean dfault)
    
    if(str == NULL)
       result = dfault;
+   else if(!strcmp(str, "n"))
+      result = FALSE;
    else if(!strcmp(str, "no"))
       result = FALSE;
    else if(!strcmp(str, "0"))
@@ -251,57 +253,16 @@ debug_get_flags_option(const char *name,
 }
 
 
-#if defined(WIN32)
-ULONG_PTR debug_config_file = 0;
-void *mapped_config_file = 0;
-
-enum {
-	eAssertAbortEn = 0x1,
-};
-
-/* Check for aborts enabled. */
-static unsigned abort_en(void)
-{
-   if (!mapped_config_file)
-   {
-      /* Open an 8 byte file for configuration data. */
-      mapped_config_file = EngMapFile(L"\\??\\c:\\gaDebug.cfg", 8, &debug_config_file);
-   }
-
-   /* A value of "0" (ascii) in the configuration file will clear the
-    * first 8 bits in the test byte. 
-    *
-    * A value of "1" (ascii) in the configuration file will set the
-    * first bit in the test byte. 
-    *
-    * A value of "2" (ascii) in the configuration file will set the
-    * second bit in the test byte. 
-    *
-    * Currently the only interesting values are 0 and 1, which clear
-    * and set abort-on-assert behaviour respectively.
-    */
-   return ((((char *)mapped_config_file)[0]) - 0x30) & eAssertAbortEn;
-}
-#else /* WIN32 */
-static unsigned abort_en(void)
-{
-   return !GETENV("GALLIUM_ABORT_ON_ASSERT");
-}
-#endif
-
 void _debug_assert_fail(const char *expr, 
                         const char *file, 
                         unsigned line, 
                         const char *function) 
 {
    _debug_printf("%s:%u:%s: Assertion `%s' failed.\n", file, line, function, expr);
-   if (abort_en())
-   {
+   if (debug_get_bool_option("GALLIUM_ABORT_ON_ASSERT", TRUE))
       debug_break();
-   } else
-   {
+   else
       _debug_printf("continuing...\n");
-   }
 }