Do not use SHELL_PATH from build system in prepare_shell_cmd on Windows

The recent change to use SHELL_PATH instead of "sh" to spawn shell commands
is not suited for Windows:

- The default setting, "/bin/sh", does not work when git has to run the
  shell because it is a POSIX style path, but not a proper Windows style
  path.

- If it worked, it would hard-code a position in the files system where
  the shell is expected, making git (more precisely, the POSIX toolset that
  is needed alongside git) non-relocatable. But we cannot sacrifice
  relocatability on Windows.

- Apart from that, even though the Makefile leaves SHELL_PATH set to
  "/bin/sh" for the Windows builds, the build system passes a mangled path
  to the compiler, and something like "D:/Src/msysgit/bin/sh" is used,
  which is doubly bad because it points to where /bin/sh resolves to on
  the system where git was built.

- Finally, the system's CreateProcess() function that is used under
  mingw.c's hood does not work with forward slashes and cannot find the
  shell.

Undo the earlier change on Windows.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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