msvc: add forgotten source file

In 1cadad6 (git clone <url> C:\cygwin\home\USER\repo' is working
(again), 2018-12-15), we introduced a new source file, containing
utility functions on Windows. But we forgot to adjust the MSVC section.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

config.mak.uname

@@ -426,6 +426,7 @@ ifeq ($(uname_S),Windows)
 	CFLAGS =
 	BASIC_CFLAGS = -nologo -I. -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE
 	COMPAT_OBJS = compat/msvc.o compat/winansi.o \
+		compat/win32/path-utils.o \
 		compat/win32/pthread.o compat/win32/syslog.o \
 		compat/win32/trace2_win32_process_info.o \
 		compat/win32/dirent.o compat/win32/fscache.o