autoconf: more variants for OSARCH linux-gnu

There are quite a few odd GNU/Linux platforms. Just call all of them
linux-gnu.

Specifically this fixes building the Debian platforms mips64el and x32.
And maybe also others.

ASTERISK-26546 #close

Change-Id: I06ec4bd7f0ee1c84b6b24d81538223b07c4174b1

configure

@@ -4927,7 +4927,7 @@ case "${host_os}" in
      OSARCH=cygwin
      PBX_WINARCH=1
      ;;
-     linux-gnueabi* |  linux-gnuspe)
+     linux-gnu*)
      OSARCH=linux-gnu
      ;;
      linux-musl*)

configure.ac

@@ -178,7 +178,7 @@ case "${host_os}" in
      OSARCH=cygwin
      PBX_WINARCH=1
      ;;
-     linux-gnueabi* |  linux-gnuspe)
+     linux-gnu*)
      OSARCH=linux-gnu
      ;;
      linux-musl*)