build: don't overwrite DISTCLEAN in performance-test

This might have worked once for some fixed order of including
makefiles, but it is clearly wrong now.

diff --git a/performance-test/Makefile.local b/performance-test/Makefile.local
index d97e56d91a121cf2ad650bb16d61fa44926c819a..cbea2d36d13c8a924c1fdf1648763e5c25b839e7 100644 (file)
--- a/performance-test/Makefile.local
+++ b/performance-test/Makefile.local
@@ -40,4 +40,4 @@ download-corpus:
        wget -O ${TXZFILE} ${DEFAULT_URL}
 
 CLEAN := $(CLEAN) $(dir)/tmp.* $(dir)/log.*
-DISTCLEAN := $(dir)/corpus $(dir)/notmuch.cache.*
+DISTCLEAN := $(DISTCLEAN) $(dir)/corpus $(dir)/notmuch.cache.*