[newlib-cygwin] cygwin: Document crypt_r

[Yaakov Selkowitz]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=ff53f489fa2f7ddf4306fe256de5609ff7a131b0

commit ff53f489fa2f7ddf4306fe256de5609ff7a131b0
Author: Yaakov Selkowitz <yselkowi@redhat.com>
Date:   Fri Sep 1 17:26:40 2017 -0500

    cygwin: Document crypt_r
    
    Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

Diff:
---
 winsup/doc/posix.xml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/winsup/doc/posix.xml b/winsup/doc/posix.xml
index 6e96272..c99e003 100644
--- a/winsup/doc/posix.xml
+++ b/winsup/doc/posix.xml
@@ -1286,6 +1286,7 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
     clog10
     clog10f
     clog10l
+    crypt_r			(available in external "crypt" library)
     dladdr			(see chapter "Implementation Notes")
     dremf
     dup3