Windows: Do not compile git-shell

Signed-off-by: NJohannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Makefile

@@ -293,7 +293,6 @@ PROGRAMS += git-pack-redundant$X
 PROGRAMS += git-patch-id$X
 PROGRAMS += git-receive-pack$X
 PROGRAMS += git-send-pack$X
-PROGRAMS += git-shell$X
 PROGRAMS += git-show-index$X
 PROGRAMS += git-unpack-file$X
 PROGRAMS += git-update-server-info$X
@@ -823,6 +822,7 @@ EXTLIBS += -lz
 ifndef NO_POSIX_ONLY_PROGRAMS
 	PROGRAMS += git-daemon$X
 	PROGRAMS += git-imap-send$X
+	PROGRAMS += git-shell$X
 endif
 ifndef NO_OPENSSL
 	OPENSSL_LIBSSL = -lssl
@@ -1363,7 +1363,7 @@ endif
 	fi && \
 	{ $(foreach p,$(BUILT_INS), $(RM) "$$execdir/$p" && ln "$$execdir/git$X" "$$execdir/$p" ;) } && \
 	$(RM) "$$execdir/git$X" && \
-	./check_bindir "z$$bindir" "z$$execdir" "$$bindir/git-shell$X"
+	./check_bindir "z$$bindir" "z$$execdir" "$$bindir/git-add$X"
 
 install-doc:
 	$(MAKE) -C Documentation install