Removed SDL_bool in favor of plain bool

We require stdbool.h in the build environment, so we might as well use the plain bool type.

If your environment doesn't have stdbool.h, this simple replacement will suffice:
typedef signed char bool;

test/testautomation_hints.c

@@ -86,7 +86,7 @@ static int SDLCALL hints_setHint(void *arg)
     char *value;
     const char *testValue;
     char *callbackValue;
-    SDL_bool result;
+    bool result;
     int i, j;
 
     /* Create random values to set */
@@ -105,7 +105,7 @@ static int SDLCALL hints_setHint(void *arg)
             result = SDL_SetHint(HintsEnum[i], value);
             SDLTest_AssertPass("Call to SDL_SetHint(%s, %s) (iteration %i)", HintsEnum[i], value, j);
             SDLTest_AssertCheck(
-                result == SDL_TRUE || result == SDL_FALSE,
+                result == true || result == false,
                 "Verify valid result was returned, got: %i",
                 (int)result);
             testValue = SDL_GetHint(HintsEnum[i]);
@@ -121,7 +121,7 @@ static int SDLCALL hints_setHint(void *arg)
         result = SDL_SetHint(HintsEnum[i], originalValue);
         SDLTest_AssertPass("Call to SDL_SetHint(%s, originalValue)", HintsEnum[i]);
         SDLTest_AssertCheck(
-            result == SDL_TRUE || result == SDL_FALSE,
+            result == true || result == false,
             "Verify valid result was returned, got: %i",
             (int)result);
         SDL_free((void *)originalValue);