make editline build properly on cygwin (bug #4624)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6029 65c4cc65-6c06-0410-ace0-fbb531ad65f3

editline/configure.in

@@ -31,7 +31,26 @@ case "${host}" in
   *-*-freebsd*)
 	ABI="elf"
 	;;
-  *-*-linux*)
+  *-*-linux* | *cygwin*)
+	cyg="$(echo ${host} | sed -e c\cygwin)"
+	if [ ${cyg} = cygwin ]; then \
+		echo "cygwin detected"; \
+		S_CFLAGS=""; \
+		echo "/* cygdef.h. Generated automatically by configure. */ 
+#ifndef _CYGDEF_H_
+#define _CYGDEF_H_ 1
+#include <sys/ioctl.h>
+#define __linux__ 1
+ 
+
+typedef void (*sig_t)(int);
+ 
+
+#endif /* _CYGDEF_H_ */" > cygdef.h; \
+	echo "
+ #define CYGWIN 1
+" > confdefs.h; \
+	fi
 	ABI="elf"
 	;;
   *-*-netbsd*)