Failure in build_haiku_image not propagated to jam.

[mmadia]

hrev35086's @alpha-raw fails to build due to size constraints. This error is not recognized by jam.

Unzipping /generated/x86gcc2/download/bebook_20081026.zip ...
Unzipping /generated/x86gcc2/download/BePDF-1.1.1b2-r1a1-x86-gcc2-2009-09-03.zip ...
Unzipping /generated/x86gcc2/download/Vision-0.9.7-H-090423.zip ...
Unzipping /generated/x86gcc2/download/VLC-0.8.6d.zip ...
Error while writing to file `/myfs/apps/vlc-0.8.6d/plugins/libfaad_plugin.so': No space left on device
Error: Command failed: No space left on device
Error: Command was:
  cp -f -r :/generated/x86gcc2/tmp/unzip/. /myfs/apps
Unzipping /generated/x86gcc2/download/WonderBrush-2.1.2.zip ...
Error while writing to file `/myfs/apps/WonderBrush/Documentation de/images/even_odd.png': No space left on device
Error: Command failed: No space left on device
Error: Command was:
  cp -f -r :/generated/x86gcc2/tmp/unzip/. /myfs/apps
Deleting old MIME database ...
Error: Failed to make directory "/myfs/home/config/settings/beos_mime": General system error
Error: Command failed: General system error
Error: Command was:
  mkdir -p /myfs/home/config/settings/beos_mime
Installing MIME database ...
Error: Failed to create `/myfs/home/config/settings/beos_mime': General system error
Error: Command failed: General system error
Error: Command was:
  cp -f -r :/generated/x86gcc2/tmp/mime/db/. /myfs/home/config/settings/beos_mime
Error while writing to attribute `COPYRIGHTS' of file `/myfs/system/apps/AboutSystem': No space left on device
Error: Command failed: No space left on device
Error: Command was:
  cp -a :/generated/x86gcc2/tmp/copyrightAttrs /myfs/system/apps/AboutSystem
Unmounting ...
...updated 539 target(s)...
/generated/x86gcc2> echo $?
0
/generated/x86gcc2>