[newlib-cygwin] Cygwin: get_rlimit_stack: add a comment

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d64cd470ae9b089d5e334efe7ed5ec4be68577d5

commit d64cd470ae9b089d5e334efe7ed5ec4be68577d5
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Nov 30 11:40:24 2021 +0100

    Cygwin: get_rlimit_stack: add a comment
    
    ...just to see what it's used for.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/resource.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/cygwin/resource.cc b/winsup/cygwin/resource.cc
index 9a3cc21b8..46d74b984 100644
--- a/winsup/cygwin/resource.cc
+++ b/winsup/cygwin/resource.cc
@@ -147,6 +147,8 @@ __get_rlimit_stack (struct rlimit *rlp)
   rlimit_stack_guard.release ();
 }
 
+/* Interface to stack limit called from pthread_create and
+   pthread_attr_getstacksize. */
 size_t
 get_rlimit_stack (void)
 {