LibC: Don't expose math.h in stdlib.h

userspace/libraries/LibC/include/stdlib.h

@@ -8,7 +8,6 @@
 __BEGIN_DECLS
 
 #include <limits.h>
-#include <math.h>
 #include <sys/wait.h>
 
 #define __need_NULL

userspace/libraries/LibImage/Image.cpp

@@ -6,6 +6,7 @@
 #include <LibImage/PNG.h>
 
 #include <fcntl.h>
+#include <math.h>
 #include <stdlib.h>
 #include <sys/mman.h>
 

userspace/programs/Shell/main.cpp

@@ -5,6 +5,7 @@
 
 #include <ctype.h>
 #include <inttypes.h>
+#include <math.h>
 #include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>