Add zstd to cleanall target and .gitignore

- Add zstd cleanup to deps/Makefile cleanall target
- Add deps/zstd/zstd-*/ to .gitignore for extracted sources

.gitignore

@@ -130,6 +130,7 @@ deps/coredumper/coredumper-*/
 deps/postgresql/postgresql-*/
 deps/postgresql/postgres-*/
 deps/libusual/libusual-*/
+deps/zstd/zstd-*/
 
 test/.vagrant
 .DS_Store

deps/Makefile

@@ -437,5 +437,6 @@ cleanall:
 	cd libusual && rm -rf libusual-*/ || true
 	cd libscram && rm -rf lib/* obj/* || true
 	cd json && rm -rf json-*/ || true
+	cd zstd && rm -rf zstd-*/ || true
 .PHONY: cleanall