Patch needed for Cygwin64 on Win 7 64

[Robert McBroom]

configuring for rxvt 2.7.10

checking for gcc... gcc
checking for C compiler default output... a.exe
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... .exe
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking how to run the C preprocessor... gcc -E
checking for a BSD-compatible install... /usr/bin/install -c
checking for gawk... gawk
checking for egrep... grep -E
checking for AIX... no
checking for library containing strerror... none required
checking build system type... autoconf/config.guess: unable to guess 
system type

This script, last modified 2002-09-03, has failed to recognize
the operating system you are using. It is advised that you
download the most up to date version of the config scripts from

    ftp://ftp.gnu.org/pub/gnu/config/

If the version you run (autoconf/config.guess) is already up to date, please
send the following data and any information you think might be
pertinent to <address@hidden> in order to provide the needed
information to handle your system.

config.guess timestamp = 2002-09-03

uname -m = x86_64
uname -r = 1.7.24(0.269/5/3)
uname -s = CYGWIN_NT-6.1
uname -v = 2013-08-15 11:59

/usr/bin/uname -p = unknown
/bin/uname -X     =

hostinfo               =
/bin/universe          =
/usr/bin/arch -k       =
/bin/arch              = x86_64
/usr/bin/oslevel       =
/usr/convex/getsysinfo =

UNAME_MACHINE = x86_64
UNAME_RELEASE = 1.7.24(0.269/5/3)
UNAME_SYSTEM  = CYGWIN_NT-6.1
UNAME_VERSION = 2013-08-15 11:59
configure: error: cannot guess build type; you must specify one