util: Revert "util: added missing headers in anon-file"

This reverts commit c73988300f943e185a50aaba015f2f114ffcb262.

Reason: Made a fix for this, then saw @eric's change
        ("util/anon_file: add missing"), but some sequence of events
        I don't really remember caused this to get merged. So revert ;-)

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
diff --git a/src/util/anon_file.c b/src/util/anon_file.c
index 90c55cd..2780c74 100644
--- a/src/util/anon_file.c
+++ b/src/util/anon_file.c
@@ -33,8 +33,6 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
 
 #ifdef __FreeBSD__
 #include <sys/mman.h>