Don't leave massif.out lying around after the benchmarks

qa/zcash/all-performance-measurements.sh

@@ -29,6 +29,10 @@ function zcashd_massif_stop {
     ms_print massif.out
 }
 
+function zcashd_massif_cleanup {
+    rm -f massif.out
+}
+
 RAWTXWITHPOUR=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
 
 echo ""
@@ -123,3 +127,5 @@ echo "------------------"
 zcashd_massif_start
 zcash_rpc zcbenchmark verifyequihash 1
 zcashd_massif_stop
+
+zcashd_massif_cleanup