rhash: Add SOVERSION guard

%ci:no-build

packages/rhash/build.sh

@@ -33,3 +33,15 @@ termux_step_make_install() {
 
 	ln -sf $TERMUX_PREFIX/lib/librhash.so.0 $TERMUX_PREFIX/lib/librhash.so
 }
+
+termux_step_post_massage() {
+	# Do not forget to bump revision of reverse dependencies and rebuild them
+	# after SOVERSION is changed.
+	local _SOVERSION_GUARD_FILES="lib/librhash.so.0"
+	local f
+	for f in ${_SOVERSION_GUARD_FILES}; do
+		if [ ! -e "${f}" ]; then
+			termux_error_exit "SOVERSION guard check failed."
+		fi
+	done
+}