Rename known lib files

src/include/PR/os_misc.h

@@ -8,4 +8,12 @@ u32 osGetCount(void);
 
 u32 osVirtualToPhysical(void *);
 
+f32 cosf(f32 arg0);
+f32 sinf(f32 arg0);
+f32 sqrtf(f32 arg0);
+
+void *memcpy(void *, const void *, size_t);
+u32 strlen(char *str);
+u32 strchr(void);
+
 #endif