build: Add -D_XOPEN_SOURCE=600 to CPPFLAGS on Cygwin

This is required to make certain math defines visible on modern Cygwin.

diff --git a/configure b/configure
index 731986a..804eee6 100755 (executable)
--- a/configure
+++ b/configure
@@ -4017,7 +4017,7 @@ probe_libc(){
     # MinGW headers can be installed on Cygwin, so check for newlib first.
     elif check_${pfx}cpp_condition newlib.h "defined _NEWLIB_VERSION"; then
         eval ${pfx}libc_type=newlib
-        add_${pfx}cppflags -U__STRICT_ANSI__
+        add_${pfx}cppflags -U__STRICT_ANSI__ -D_XOPEN_SOURCE=600
     # MinGW64 is backwards compatible with MinGW32, so check for it first.
     elif check_${pfx}cpp_condition _mingw.h "defined __MINGW64_VERSION_MAJOR"; then
         eval ${pfx}libc_type=mingw64