W32 build fails with "incorrect" CFLAGS

[Sridhar Boovaraghavan]

Just so that others do not encounter something similar:

I had configured with --cflags -ID:\Utilities\GnuWin32\include and then did a
make bootstrap on a recently fetched HEAD.

This failed with the following error.

gcc -I. -c -gdwarf-2 -g3  -mtune=pentium4 -O2    -ID:\Utilities\GnuWin32\include
 -Demacs=1 -DHAVE_CONFIG_H -I../nt/inc -DHAVE_NTGUI=1 -DUSE_CRT_DLL=1 -DPURESIZE
=5000000 -o oo-spd/i386/w32.o w32.c
w32.c:1749:27: warning: universal character names are only valid in C++ and C99
w32.c:1749:27: incomplete universal character name \U
w32.c:1749:27: warning: unknown escape sequence '\G'
w32.c:1749:27: warning: unknown escape sequence '\i'

I reconfigured with --cflags -ID:/Utilities/GnuWin32/include and it was fine.

Regards,
Sridhar