conceals failures from cl

[rdp]

Would be nice if it output to the screen failures from its sub process (ex: cl).
at least it didn't for me just now, FWIW (msys).

$ c99wrap cl ...   -c -o libavdevice/alldevices.o libavdevice/alldevices.c

rdp@roger-win10 MSYS /c/dev/ffmpeg/ffmpeg_git_msvc
$ echo $?
1

rdp@roger-win10 MSYS /c/dev/ffmpeg/ffmpeg_git_msvc
$ cl...   -c -o libavdevice/alldevices.o libavdevice/alldevices.c
cl : Command line warning D9035 : option 'o' has been deprecated and will be removed in a future release
alldevices.c
c:\dev\ffmpeg\ffmpeg_git_msvc\libavutil\common.h(34) : fatal error C1083: Cannot open include file: 'inttypes.h': No such file or directory

(the latter said what the error was)