Added func used in comments

src/models.c

@@ -45,7 +45,7 @@
 
 #include "utils.h"          // Required for: fopen() Android mapping
 
-#include <stdlib.h>         // Required for: malloc(), free()
+#include <stdlib.h>         // Required for: malloc(), free(), fabs()
 #include <stdio.h>          // Required for: FILE, fopen(), fclose()
 #include <string.h>         // Required for: strncmp() [Used in LoadModelAnimations()], strlen() [Used in LoadTextureFromCgltfImage()]
 #include <math.h>           // Required for: sinf(), cosf(), sqrtf()

src/rlgl.h

@@ -621,7 +621,7 @@ RLAPI int GetPixelDataSize(int width, int height, int format);// Get pixel data
     #endif
 #endif
 
-#include <stdlib.h>                 // Required for: malloc(), free()
+#include <stdlib.h>                 // Required for: malloc(), free(), fabs()
 #include <stdio.h>                  // Required for: fopen(), fseek(), fread(), fclose() [LoadText]
 #include <string.h>                 // Required for: strcmp(), strlen() [Used in rlglInit(), on extensions loading]
 #include <math.h>                   // Required for: atan2f()

src/textures.c

@@ -64,7 +64,7 @@
     #include "config.h"         // Defines module configuration flags
 #endif
 
-#include <stdlib.h>             // Required for: malloc(), free()
+#include <stdlib.h>             // Required for: malloc(), free(), fabs()
 #include <stdio.h>              // Required for: FILE, fopen(), fclose(), fread()
 #include <string.h>             // Required for: strlen() [Used in ImageTextEx()]