box2d: update to 3.1.0

vendor/libc/include/math.h

@@ -47,19 +47,19 @@ bool __isnanf(float);
 bool __isnand(double);
 #define isnan(x)                                           \
     ( sizeof(x) == sizeof(float)  ? __isnanf((float)(x))   \
-    :                             : __isnand((double)(x)))
+                                  : __isnand((double)(x)))
 
 bool __isinff(float);
 bool __isinfd(double);
 #define isinf(x)                                           \
     ( sizeof(x) == sizeof(float)  ? __isinff((float)(x))   \
-    :                             : __isinfd((double)(x)))
+                                  : __isinfd((double)(x)))
 
 bool __isfinitef(float);
 bool __isfinited(double);
 #define isfinite(x)                                           \
     ( sizeof(x) == sizeof(float)  ? __isfinitef((float)(x))   \
-    :                             : __isfinited((double)(x)))
+                                  : __isfinited((double)(x)))
 
 #ifdef __cplusplus
 }

vendor/libc/include/sched.h

@@ -0,0 +1,23 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#pragma once
+
+#include <stdint.h>
+
+#define CLOCK_MONOTONIC 1
+
+struct timespec
+{
+    int64_t tv_sec;
+    int64_t tv_nsec;
+};
+
+int clock_gettime(int clockid, struct timespec *tp);
+
+int sched_yield();
+
+#ifdef __cplusplus
+}
+#endif