Unbreak the build.

Commit ffd5365 broke the build for
anyone not compiling with LZ4 and ZSTD enabled. Woops.

Author: robertmhaas

src/backend/replication/basebackup_lz4.c

@@ -61,15 +61,14 @@ const bbsink_ops bbsink_lz4_ops = {
 bbsink *
 bbsink_lz4_new(bbsink *next, bc_specification *compress)
 {
-	int		compresslevel;
-
 #ifndef USE_LZ4
 	ereport(ERROR,
 			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 			 errmsg("lz4 compression is not supported by this build")));
 	return NULL;				/* keep compiler quiet */
 #else
 	bbsink_lz4 *sink;
+	int		compresslevel;
 
 	Assert(next != NULL);
 

src/backend/replication/basebackup_zstd.c

@@ -60,15 +60,14 @@ const bbsink_ops bbsink_zstd_ops = {
 bbsink *
 bbsink_zstd_new(bbsink *next, bc_specification *compress)
 {
-	int		compresslevel;
-
 #ifndef USE_ZSTD
 	ereport(ERROR,
 			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 			 errmsg("zstd compression is not supported by this build")));
 	return NULL;				/* keep compiler quiet */
 #else
 	bbsink_zstd *sink;
+	int		compresslevel;
 
 	Assert(next != NULL);