GNUmakefile: Don't install part of hashsum if we excluded hashsum (#9036)

* Clear HASHSUM_PROGS

* Drop wrong endif

* Fix cspell

* Flip wrong ifeq

.github/workflows/CICD.yml

@@ -290,6 +290,7 @@ jobs:
           mv -T target target.cache
         fi
         # Check that we don't cross-build uudoc
+        # also do not try to generate manpages for part of hashsum
         make install-manpages PREFIX=/tmp/usr UTILS=true RUSTC_ARCH="--target aarch64-unknown-linux-gnu"
         # build (host)
         make build

GNUmakefile

@@ -230,6 +230,9 @@ ifneq ($(OS),Windows_NT)
 endif
 
 UTILS ?= $(filter-out $(SKIP_UTILS),$(PROGS))
+ifneq ($(filter hashsum,$(UTILS)),hashsum)
+	HASHSUM_PROGS :=
+endif
 
 ifneq ($(findstring stdbuf,$(UTILS)),)
     # Use external libstdbuf per default. It is more robust than embedding libstdbuf.