Only include alloca.h on Solaris-likes
The header does not exist on BSDs, breaking the build, and is not required on GNU.
Signed-off-by: Sijmen J. Mulder ik@sjmulder.nl
The header does not exist on BSDs, breaking the build, and is not required on GNU.
Signed-off-by: Sijmen J. Mulder ik@sjmulder.nl