Add latest changes to release message

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/release/2.5.0

@@ -53,6 +53,12 @@ What changed:
   enables multiple gmon.out files to preserve profiling data after fork or
   from multiple program runs.
 
+- Feature test macros, which control which symbols are exposed in the standard
+  headers, have been completely overhauled for compatibility with glibc.
+
+- The isinf, isinff, and isinfl functions are signed, returning -1 for
+  negative infinity for compatibility with glibc.
+
 
 Bug Fixes
 ---------
@@ -105,3 +111,5 @@ Bug Fixes
 
 - Fix strtold return value for +/-infinity.
   Addresses: https://cygwin.com/ml/cygwin-apps/2016-03/msg00152.html
+
+- Fix accepted specifications with `getconf -v' on 64-bit.  Self-observed.

winsup/doc/new-features.xml

@@ -76,6 +76,16 @@ enables multiple gmon.out files to preserve profiling data after fork or
 from multiple program runs.
 </para></listitem>
 
+<listitem><para>
+Feature test macros, which control which symbols are exposed in the standard
+headers, have been completely overhauled for compatibility with glibc.
+</para></listitem>
+
+<listitem><para>
+The isinf, isinff, and isinfl functions are signed, returning -1 for
+negative infinity for compatibility with glibc.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>