Fix symlinking to multiarch tools on Cygwin

On cygwin, creating both "foo.exe" and "foo" results in 'ln -sf'
returning an error ("File exists"). However, ln silently removes
the "foo.exe" in this case, so an attempt to re-run the same command
manually then succeeds.

Hence, make binutils.sh also create symlinks with .exe prefix,
using the new & shiny routine.

Signed-off-by: Alexey Neyman <stilor@att.net>

scripts/functions

@@ -1784,7 +1784,11 @@ CT_SymlinkTools()
 
     CT_Pushd "${srcdir}"
     for t in "${CT_TARGET}-"*; do
-        if [ -n "${newpfx}" -a "${newpfx}" != "${CT_TARGET}" ]; then
+        if [ "${t}" = "${CT_TARGET}-*" ]; then
+            # No matching files
+            break
+        fi
+        if [ "${newpfx}" != "${CT_TARGET}" -o "${bindir}" != "${srcdir}" ]; then
             _t="${newpfx}-${t#${CT_TARGET}-}"
             CT_DoExecLog ALL ln -sfv "${dirpfx}${t}" "${bindir}/${_t}"
         fi