$NetBSD$

Nonportable shell syntax fixed.
This patch is intended as workaround until configure.ac patch is merged.

--- gdb/configure.orig	2022-05-01 18:46:31.000000000 +0000
+++ gdb/configure
@@ -18834,7 +18834,7 @@ else
 fi
 
 
-if test "${enable_libbacktrace}" == "yes"; then
+if test "${enable_libbacktrace}" = "yes"; then
   LIBBACKTRACE_INC="-I$srcdir/../libbacktrace/ -I../libbacktrace/"
   LIBBACKTRACE_LIB=../libbacktrace/.libs/libbacktrace.a
 
