boost: disable stactrace from exception on i686

srcpkgs/boost/template

@@ -75,8 +75,11 @@ else
 	makedepends+=" libbacktrace"
 	subpackages+=" libboost_stacktrace_backtrace"
 fi
+
+_bst_except=off
 case "$XBPS_TARGET_MACHINE" in
-	i686*|x86_64*)
+	x86_64*)
+		_bst_except=on
 		subpackages+=" libboost_stacktrace_from_exception"
 		;;
 esac
@@ -134,6 +137,7 @@ do_build() {
 		--user-config=${wrksrc}/user-config.jam \
 		--toolset=gcc abi=${_abi} architecture=${_arch} \
 		python=${py3_ver} release \
+		boost.stacktrace.from_exception="${_bst_except}" \
 		cxxflags="${CXXFLAGS}" linkflags="${LDFLAGS}" \
 		threading=multi runtime-link=shared link=shared,static
 }