Fix MSVC warnings.

Author: MarekKnapek

nob.h

@@ -2093,14 +2093,14 @@ NOBDEF bool nob_read_entire_file(const char *path, Nob_String_Builder *sb)
     if (m < 0)                     nob_return_defer(false);
     if (fseek(f, 0, SEEK_SET) < 0) nob_return_defer(false);
 
-    new_count = sb->count + m;
+    new_count = sb->count + (size_t)m;
     if (new_count > sb->capacity) {
         sb->items = NOB_DECLTYPE_CAST(sb->items)NOB_REALLOC(sb->items, new_count);
         NOB_ASSERT(sb->items != NULL && "Buy more RAM lool!!");
         sb->capacity = new_count;
     }
 
-    fread(sb->items + sb->count, m, 1, f);
+    fread(sb->items + sb->count, (size_t)m, 1, f);
     if (ferror(f)) {
         // TODO: Afaik, ferror does not set errno. So the error reporting in defer is not correct in this case.
         nob_return_defer(false);