$NetBSD$

Fix portability issues.

--- libs/spandsp/configure.orig	2017-04-19 13:12:06.824318000 +0000
+++ libs/spandsp/configure
@@ -24108,7 +24108,7 @@ done
     ;;
 esac
 
-if test "${build}" == "${host}"
+if test "${build}" = "${host}"
 then
 
 for ac_header in X11/X.h
@@ -25692,7 +25692,7 @@ ac_link='$CC -o conftest$ac_exeext $CFLA
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
-if test "${build}" == "${host}"
+if test "${build}" = "${host}"
 then
     case "${host}" in
     x86_64-*)
