Revert "prereq: SetupHostCommand: fix wrong check result"

This reverts commit 7855378fcd.

The return "exit 1" was intentional and actually just
makes the symlink checks much more strict.

This new level of strictness added to the checks revealed
what was a confusing regression with prereq stage that
already existed but was not presenting itself
because of the simple way that checks used to be done before.

Either way, reverting to "exit 0" was a nice workaround
until the true root cause was discovered, so as to not interfere
with others' pull requests and builds in the meantime.

It turns out that this problem was the inconsistent value of $PATH
between different commands within the SetupHostCommand recipe,
now fixed in the parent commit, using the variable created
in the parent of the parent commit.

Ref: f75204036c ("prereq-build: allow host command symlinks to update")
Signed-off-by: Michael Pratt <mcpratt@pm.me>

include/prereq.mk

@@ -112,7 +112,7 @@ define SetupHostCommand
 						;; \
 				esac; \
 				ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
-				exit 0; \
+				exit 1; \
 			fi; \
 		fi; \
 	done; \