Address review comments: `target` and `depends/work` should be cleaned by clean.sh.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

zcutil/clean.sh

@@ -27,6 +27,8 @@ rm -f src/fuzz.cpp
 rm -rf test_bitcoin.coverage/ zcash-gtest.coverage/ total.coverage/
 
 rm -rf cache
+rm -rf target
+rm -rf depends/work
 
 find src -type f -and \( -name '*.Po' -or -name '*.Plo' -or -name '*.o' -or -name '*.a' -or -name '*.la' -or -name '*.lo' -or -name '*.lai' -or -name '*.pc' -or -name '.dirstamp' -or -name '*.gcda' -or -name '*.gcno' -or -name '*.sage.py' -or -name '*.trs' \) -delete
 

zcutil/distclean.sh

@@ -4,10 +4,8 @@
 zcutil/clean.sh
 
 rm -rf depends/*-*-*
-rm -rf depends/work
 rm -rf depends/built
 rm -rf depends/sources
-rm -rf target
 
 rm -rf afl-temp
 rm -rf src/fuzzing/*/output