SDL_ttf.c: remove unnecessary libc headers. move SDL includes before …

…others.

showfont.c: move SDL includes before libc headers.

c.f.:  https://bugzilla.libsdl.org/show_bug.cgi?id=5107

SDL_ttf.c

@@ -19,10 +19,11 @@
   3. This notice may not be removed or altered from any source distribution.
 */
 
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include "SDL.h"
+#include "SDL_cpuinfo.h"
+#include "SDL_endian.h"
+
+#include "SDL_ttf.h"
 
 #include <ft2build.h>
 #include FT_FREETYPE_H
@@ -31,11 +32,6 @@
 #include FT_GLYPH_H
 #include FT_TRUETYPE_IDS_H
 
-#include "SDL.h"
-#include "SDL_cpuinfo.h"
-#include "SDL_endian.h"
-#include "SDL_ttf.h"
-
 #ifndef TTF_USE_HARFBUZZ
 #  define TTF_USE_HARFBUZZ 0
 #endif

showfont.c

@@ -21,13 +21,13 @@
 
 /* A simple program to test the text rendering feature of the TTF library */
 
+#include "SDL.h"
+#include "SDL_ttf.h"
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
-#include "SDL.h"
-#include "SDL_ttf.h"
-
 #define DEFAULT_PTSIZE  18
 #define DEFAULT_TEXT    "The quick brown fox jumped over the lazy dog"
 #define WIDTH   640