build: don't include winsock2.h on cygwin

Under cygwin, winsock2.h is intentionally incompatible with,
<sys/socket.h>, and checking for existence is wrong.

Under mingw, HAVE_WINSOCK2_H is defined on our behalf by
gnulib, in a way that does not interfere with cygwin.

* configure.ac: Drop unnecessary header check.
Reported by Matthias Bolte.

diff --git a/configure.ac b/configure.ac
index 99bc90639644bcc1ca6b88801d6797a191544f48..deaa697331ca7e40db6ea4332ff4e766303a3bbd 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -112,7 +112,8 @@ dnl Availability of various not common threadsafe functions
 AC_CHECK_FUNCS([strerror_r strtok_r getmntent_r getgrnam_r getpwuid_r])
 
 dnl Availability of various common headers (non-fatal if missing).
-AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h sys/wait.h winsock2.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h])
+AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h
+  sys/wait.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h])
 
 dnl Where are the XDR functions?
 dnl If portablexdr is installed, prefer that.