libwebsockets: Add SOVERSION guard

%ci:no-build

packages/libwebsockets/build.sh

@@ -18,3 +18,15 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 TERMUX_PKG_RM_AFTER_INSTALL="lib/pkgconfig/libwebsockets_static.pc"
 TERMUX_PKG_AUTO_UPDATE=true
 TERMUX_PKG_UPDATE_TAG_TYPE="newest-tag"
+
+termux_step_post_get_source() {
+	# Do not forget to bump revision of reverse dependencies and rebuild them
+	# after SOVERSION is changed.
+	local _SOVERSION=19
+
+	local v=$(sed -En 's/^set\(SOVERSION\s+"?([0-9]+).*/\1/p' \
+			CMakeLists.txt)
+	if [ "${v}" != "${_SOVERSION}" ]; then
+		termux_error_exit "SOVERSION guard check failed."
+	fi
+}