bug#14821: Build broken on 64-bit Cygwin starting with bzr revision 113315

[Ken Brown <kbrown@cornell.edu>]

Starting with bzr revision 113315, the build on 64-bit Cygwin fails as 
follows:

gcc -std=gnu99 -Demacs  -I. -I/c/src/emacs/64testt/src  -I../lib 
-I/c/src/emacs/64testt/src/../lib    -D_REENTRANT -I/usr/include/gtk-3.0 
-I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 
-I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ 
-I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/pixman-1 
-I/usr/include/libpng15   -DGDK_DISABLE_DEPRECATION_WARNINGS 
-DGLIB_DISABLE_DEPRECATION_WARNINGS -I/usr/include/freetype2 
-D_REENTRANT -I/usr/include/librsvg-2.0 -I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include -I/usr/include/gdk-pixbuf-2.0 
-I/usr/include/cairo -I/usr/include/libpng15 -I/usr/include/pixman-1 
-I/usr/include/freetype2   -fopenmp -I/usr/include/ImageMagick 
-I/usr/include/libxml2   -I/usr/include/dbus-1.0 
-I/usr/lib/dbus-1.0/include      -D_REENTRANT -I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include   -D_REENTRANT -I/usr/include/gconf/2 
-I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/freetype2       -MMD -MF deps/.d -MP 
-I/usr/include/p11-kit-1   -D_REENTRANT -I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include      -O0 -ggdb    \
   -o temacs  vm-limit.o dispnew.o frame.o scroll.o xdisp.o menu.o 
xmenu.o window.o  charset.o coding.o category.o ccl.o character.o 
chartab.o bidi.o  cm.o term.o terminal.o xfaces.o xterm.o xfns.o 
xselect.o xrdb.o xsmfns.o xsettings.o gtkutil.o emacsgtkfixed.o 
dbusbind.o  emacs.o keyboard.o macros.o keymap.o sysdep.o  buffer.o 
filelock.o insdel.o marker.o  minibuf.o fileio.o dired.o  cmds.o 
casetab.o casefiddle.o indent.o search.o regex.o undo.o  alloc.o data.o 
doc.o editfns.o callint.o  eval.o floatfns.o fns.o font.o print.o 
lread.o  syntax.o unexcw.o bytecode.o  process.o gnutls.o callproc.o 
region-cache.o sound.o atimer.o  doprnt.o intervals.o textprop.o 
composite.o xml.o gfilenotify.o  profiler.o     sheap.o cygw32.o xfont.o 
ftfont.o xftfont.o ftxfont.o   fontset.o fringe.o image.o xgselect.o 
terminfo.o  gmalloc.o   lastfile.o   ../lib/libgnu.a       -ltiff -ljpeg 
-lpng -lz -lm -lgif -lXpm  -lgtk-3 -latk-bridge-2.0 -lgdk-3 -latk-1.0 
-lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage 
-lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lgio-2.0 -lXfixes 
-lpangoft2-1.0 -lharfbuzz -lpango-1.0 -lcairo -lpixman-1 -lfontconfig 
-lexpat -lfreetype -lbz2 -lxcb-shm -lxcb-render -lXrender -lXext -lX11 
-lxcb -lXau -lXdmcp -lpng15 -lm -lz -lgmodule-2.0 -lgobject-2.0 -lffi 
-lglib-2.0 -lintl -liconv -lpcre   -lSM -lICE -lX11 -lXrender -lXft 
-lXrender -lfontconfig -lexpat -lfreetype -lz -lbz2 -lX11 -lxcb -lXau 
-lXdmcp     -lrsvg-2 -lgio-2.0 -lgdk_pixbuf-2.0 -lcairo -lgmodule-2.0 
-lgobject-2.0 -lffi -lpixman-1 -lfontconfig -lexpat -lfreetype -lbz2 
-lpng15 -lm -lz -lxcb-shm -lxcb-render -lXrender -lXext -lglib-2.0 
-lintl -liconv -lpcre -lX11 -lxcb -lXau -lXdmcp   -lMagickWand 
-lMagickCore         -ldbus-1 -lpthread -lrt     -lXrandr -lXext 
-lXrender -lX11 -lxcb -lXau -lXdmcp   -lXinerama -lXext -lX11 -lxcb 
-lXau -lXdmcp    -lxml2 -lz -liconv -lm       -lncurses  -lgio-2.0 -lz 
-lgmodule-2.0 -lgobject-2.0 -lffi -lglib-2.0 -lintl -liconv -lpcre 
-lgconf-2 -ldbus-1 -lpthread -lrt -lgio-2.0 -lz -lgmodule-2.0 
-lgobject-2.0 -lffi -lglib-2.0 -lintl -liconv -lpcre   -lgobject-2.0 
-lffi -lglib-2.0 -lintl -liconv -lpcre     -lfreetype -lz -lbz2 
-lfontconfig -lexpat -lfreetype -lz -lbz2      -lgnutls -lnettle 
-lhogweed -lgmp -lintl -liconv -ltasn1 -lp11-kit -lz   -lpthread 
-lgio-2.0 -lz -lgmodule-2.0 -lgobject-2.0 -lffi -lglib-2.0 -lintl 
-liconv -lpcre
../lib/libgnu.a(pipe2.o): In function `rpl_pipe2':
/c/src/emacs/64testt/lib/pipe2.c:144: undefined reference to `setmode'


I think the issue here is that pipe2.c shouldn't be compiled on Cygwin.

Ken