* configure.in: Use test -f instead of test -e.
Patch by John Tobey <jtobey@banta-im.com>.
* sysdeps/unix/sysv/sysv4/solaris2/sparc/sys/trap.h: New file.
* sysdeps/unix/sysv/sysv4/solaris2/sys/syscall.h: New file.
* sysdeps/unix/sysv/sysv4/solaris2/bits/sigstack.h: New file.
* sysdeps/unix/sysv/linux/sigstack.c: Fix typo.
* sysdeps/unix/sysv/sysv4/solaris2/sigwaitinfo.c: Fix typo.
* sysdeps/unix/sysv/sysv4/solaris2/sparc/sys/ucontext.h: New file.
* sysdeps/unix/sysv/sysv4/solaris2/sys/param.h: New file.
Patches by John Tobey <jtobey@banta-im.com>.
