Makefile: install hardlinks for git-remote-<scheme> supported by libcurl if possible

Instead of installing/copying three programs separately, just install one
and try to make hardlinks to the other two.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -383,7 +383,8 @@ BUILT_INS += git-stage$X
 BUILT_INS += git-status$X
 BUILT_INS += git-whatchanged$X
 
-# what 'all' will build and 'install' will install, in gitexecdir
+# what 'all' will build and 'install' will install in gitexecdir,
+# excluding programs for built-in commands
 ALL_PROGRAMS = $(PROGRAMS) $(SCRIPTS)
 
 # what 'all' will build but not install in gitexecdir
@@ -1661,7 +1662,7 @@ export gitexec_instdir
 install: all
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) $(ALL_PROGRAMS) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
+	$(INSTALL) $(filter-out $(CURL_SYNONYMS), $(ALL_PROGRAMS)) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
 	$(INSTALL) git$X git-upload-pack$X git-receive-pack$X git-upload-archive$X git-shell$X git-cvsserver '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(MAKE) -C templates DESTDIR='$(DESTDIR_SQ)' install
 ifndef NO_PERL
@@ -1687,6 +1688,12 @@ endif
 		ln -s "git$X" "$$execdir/$$p" 2>/dev/null || \
 		cp "$$execdir/git$X" "$$execdir/$$p" || exit; \
 	  done; } && \
+	{ for p in $(CURL_SYNONYMS); do \
+		$(RM) "$$execdir/$$p" && \
+		ln "$$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"
 
 install-doc: