Makefile: remove the check_bindir script

This script was added in f28ac70 (Move all dashed-form commands to
libexecdir, 2007-11-28) when commands such as "git-add" lived in the
bin directory, instead of the git exec directory.

This notice helped someone incorrectly installing version v1.6.0 and
later into a directory built for a pre-v1.6.0 git version.

We're now long past the point where anyone who'd be helped by this
warning is likely to be doing that, so let's just remove this check
and warning to simplify the Makefile.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

Makefile

@@ -3090,8 +3090,7 @@ endif
 		  ln "$$execdir/git-remote-http$X" "$$execdir/$$p" 2>/dev/null || \
 		  ln -s "git-remote-http$X" "$$execdir/$$p" 2>/dev/null || \
 		  cp "$$execdir/git-remote-http$X" "$$execdir/$$p" || exit; } \
-	done && \
-	./check_bindir "z$$bindir" "z$$execdir" "$$bindir/git-add$X"
+	done
 
 .PHONY: install-gitweb install-doc install-man install-man-perl install-html install-info install-pdf
 .PHONY: quick-install-doc quick-install-man quick-install-html