Fix strict aliasing violation in FMotion.cpp

Bug: https://bugs.gentoo.org/928251

--- a/src/FMotion.cpp
+++ b/src/FMotion.cpp
@@ -22,6 +22,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <cmath>
 
 // In case cmath doesn't pull in all the usual suspects from math.h
@@ -54,15 +55,19 @@
 #define FLOATTOINTCONST2 (((65536.0*16)))
 inline int f2int2 (float f)
 {
+	int i;
 	f += FLOATTOINTCONST2;
-	return ((*((int *)(void *)&f)) & 0x007fffff) - 0x00400000;
+	memcpy(&i, &f, sizeof(i));
+	return (i & 0x007fffff) - 0x00400000;
 }
 
 #define FLOATTOINTCONST (((1.5*65536*256)))
 inline int f2int (float f)
 {
+	int i;
 	f += FLOATTOINTCONST;
-	return ((*((int *)(void *)&f)) & 0x007fffff) - 0x00400000;
+	memcpy(&i, &f, sizeof(i));
+	return (i & 0x007fffff) - 0x00400000;
 }
 
 #define Float2Int(f) (f2int(f))