Added SDL_round(), contributed by Benoit Pierre - thanks!

src/dynapi/SDL_dynapi_overrides.h

@@ -591,3 +591,4 @@
 #define SDL_QueueAudio SDL_QueueAudio_REAL
 #define SDL_GetQueuedAudioSize SDL_GetQueuedAudioSize_REAL
 #define SDL_ClearQueuedAudio SDL_ClearQueuedAudio_REAL
+#define SDL_round SDL_round_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -623,3 +623,4 @@ SDL_DYNAPI_PROC(SDL_bool,SDL_HasAVX2,(void),(),return)
 SDL_DYNAPI_PROC(int,SDL_QueueAudio,(SDL_AudioDeviceID a, const void *b, Uint32 c),(a,b,c),return)
 SDL_DYNAPI_PROC(Uint32,SDL_GetQueuedAudioSize,(SDL_AudioDeviceID a),(a),return)
 SDL_DYNAPI_PROC(void,SDL_ClearQueuedAudio,(SDL_AudioDeviceID a),(a),)
+SDL_DYNAPI_PROC(double,SDL_round,(double a),(a),return)

src/libm/math_libm.h

@@ -30,6 +30,7 @@ double SDL_uclibc_fabs(double x);
 double SDL_uclibc_floor(double x);
 double SDL_uclibc_log(double x);
 double SDL_uclibc_pow(double x, double y);    
+double SDL_uclibc_round(double x);
 double SDL_uclibc_scalbn(double x, int n);
 double SDL_uclibc_sin(double x);
 double SDL_uclibc_sqrt(double x);

src/libm/math_private.h

@@ -37,6 +37,7 @@ typedef unsigned int u_int32_t;
 #define floor           SDL_uclibc_floor
 #define __ieee754_log   SDL_uclibc_log
 #define __ieee754_pow   SDL_uclibc_pow
+#define round           SDL_uclibc_round
 #define scalbn          SDL_uclibc_scalbn
 #define sin             SDL_uclibc_sin
 #define __ieee754_sqrt  SDL_uclibc_sqrt

src/stdlib/SDL_stdlib.c

@@ -169,6 +169,16 @@ SDL_pow(double x, double y)
 #endif /* HAVE_POW */
 }
 
+double
+SDL_round(double x)
+{
+#if defined(HAVE_ROUND)
+    return round(x);
+#else
+    return SDL_uclibc_round(x);
+#endif /* HAVE_ROUND */
+}
+
 double
 SDL_scalbn(double x, int n)
 {