[Bug 24221] New: Missing icotools causes build to fail

http://bugs.winehq.org/show_bug.cgi?id=24221

Summary: Missing icotools causes build to fail
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: build-env
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

If maintainer mode is enabled and icotools is missing or too old, the ICOTOOLS
variable gets the value "false" and the build fails with the following error:

make[1]: Entering directory `/home/tdb/src/wine/wine-build/programs/winecfg'
CONVERT="convert" ICOTOOL="false" RSVG="rsvg"
../../../wine-git/tools/buildimage
../../../wine-git/programs/winecfg/winecfg.svg
../../../wine-git/programs/winecfg/winecfg.ico
false -c -o ../../../wine-git/programs/winecfg/winecfg.ico
../../../wine-git/programs/winecfg/winecfg-16-4.png
../../../wine-git/programs/winecfg/winecfg-16-8.png
../../../wine-git/programs/winecfg/winecfg-16-32.png
../../../wine-git/programs/winecfg/winecfg-32-4.png
../../../wine-git/programs/winecfg/winecfg-32-8.png
../../../wine-git/programs/winecfg/winecfg-48-4.png
../../../wine-git/programs/winecfg/winecfg-48-8.png
../../../wine-git/programs/winecfg/winecfg-32-32.png
../../../wine-git/programs/winecfg/winecfg-48-32.png failed: 256 at
../../../wine-git/tools/buildimage line 63.
make[1]: *** [../../../wine-git/programs/winecfg/winecfg.ico] Error 9
make[1]: Leaving directory `/home/tdb/src/wine/wine-build/programs/winecfg'

configure does give a warning about it ("icotool is missing, icons can't be
rebuilt" or "icotool version 0.29.0 or newer is needed to rebuild icons"), but
since it's only a warning, I'd expect the build to succeed but skip over the
icons.  Especially as other such warnings (missing fontforce, prelink and xslt
on my machine) don't cause the build to fail.