Added precompiled header support for Visual Studio and Xcode (#6710)

Fixes https://github.com/libsdl-org/SDL/issues/6704

src/libm/e_atan2.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_exp.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_fmod.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_log.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_log10.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_pow.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_rem_pio2.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/e_sqrt.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/k_cos.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/k_rem_pio2.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/k_sin.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/k_tan.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/math_libm.h

@@ -22,7 +22,7 @@
 #ifndef math_libm_h_
 #define math_libm_h_
 
-#include "../SDL_internal.h"
+#include "SDL_internal.h"
 
 /* Math routines from uClibc: http://www.uclibc.org */
 

src/libm/s_atan.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_copysign.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_cos.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_fabs.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_floor.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_scalbn.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_sin.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

src/libm/s_tan.c

@@ -1,3 +1,4 @@
+#include "SDL_internal.h"
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.