Revert "Check effective credentials of socket peers"

This reverts commit 8412c867a501e3a68e55fef6215e86d3ac9f617b.

Just checking the credentials of the peer turns out to be insufficient.
See https://github.com/fish-shell/fish-shell/issues/1436.

1 files changed, 0 insertions, 4 deletions

diff --git a/fallback.h b/fallback.h
index 6898ea57..eba91be6 100644
--- a/fallback.h
+++ b/fallback.h
@@ -482,7 +482,3 @@ double nan(char *tagp);
 
 
 #endif
-
-#ifndef HAVE_GETPEEREID
-int getpeereid(int sock, uid_t *uid, gid_t *gid);
-#endif