detect ARM Linux EABI OSARCH as linux-gnu instead of linux-gnueabi

* Set OSARCH to linux-gnu even if host_os is linux-gnueabi
* When checking if we are Linux, check OSARCH rather than host_os

The newer ARM ABI ("EABI") shows the OS name 'linux-gnueabi' rather than
'linux-gnu' . This patch sets OSARCH to be 'linux-gnu' even in such a case.

OSARCH is tested for the value of 'linux-gnu' in one or two places in the
tree. This patch also fixes the check libcap to check for $OSARCH rather
than $host_os .

See also: http://wiki.debian.org/ArmEabiPort

Merged revisions 225957 via svnmerge from 
http://svn.digium.com/svn/asterisk/branches/1.4


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@226018 f38db490-d61c-443f-a65b-d21fe96a405b

configure.ac

@@ -121,6 +121,9 @@ case "${host_os}" in
      OSARCH=cygwin
      PBX_WINARCH=1
      ;;
+     linux-gnueabi)
+     OSARCH=linux-gnu
+     ;;
      *)
      OSARCH=${host_os}
      ;;
@@ -708,7 +711,7 @@ AST_EXT_LIB_CHECK([ALSA], [asound], [snd_spcm_init], [alsa/asoundlib.h], [-lm -l
 
 AST_EXT_LIB_CHECK([CURSES], [curses], [initscr], [curses.h])
 
-if test "x${host_os}" = "xlinux-gnu" ; then
+if test "x${OSARCH}" = "xlinux-gnu" ; then
   AST_EXT_LIB_CHECK([CAP], [cap], [cap_from_text], [sys/capability.h])
 fi