allow executing a path in backslash notation

Tue Mar 9 00:49:00 GMT 2010

The attached patch allows executing a path in backslash notation. This can be tested in the Cygwin builds of GNU make with the "DOS compatibility" compile-time option of GNU make enabled, such as those from Cygwin make packages 3.79 and 3.80.
$ cat dos-compat.mak
default:
 ..\echo.exe test
 C:\<FULLPATH>\echo.exe test
$ ./make.exe --win32 -f dos-compat.mak
..\echo.exe test
test
C:\<FULLPATH>\echo.exe test
test
The patch cannot be tested by simply running a command in backslash notation in the existing Cygwin build of bash or pdksh because these shells re-implement the search of the potential executable command. I believe these re-implementations are for improved user interaction and platform-independent security.
The patch is a blind conjecture because I am not fully aware about the intention of find_exec() in spawn.cc. Its implementation seems exceedingly complicated to me, and the comments in the middle of the function about refusing a full Windows path contradict the description of the function above its prototype.
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