Build failure on Windows

[martin rudalics]

Current master fails to build on Windows XP as

floatfns.o: In function `ecount_leading_zeros':
c:\emacs-git\trunk\dbg\src/../../src/floatfns.c:298: undefined reference to 
`count_leading_zeros_ll'
collect2: ld returned 1 exit status
make[1]: *** [temacs.exe] Error 1
make[1]: Leaving directory `/c/emacs-git/trunk/dbg/src'
make: *** [src] Error 2

In the past weeks I spent many, many hours rebuilding and bootstrapping
master with all sorts of failures.  I'll stop pulling now until the
situation improves.

martin