Makefile: drop support for curl < 7.9.8 (again)

In 1119a15 (http: drop support for curl < 7.11.1, 2021-07-30)
support for curl versions older than 7.11.1 was removed, and we
currently require at least version 7.19.4, see 644de29 (http: drop
support for curl < 7.19.4, 2021-07-30).

In those changes this Makefile-specific check added in
0890098 (Decide whether to build http-push in the Makefile,
2005-11-18) was missed, now that we're never going to use such an
ancient curl version we don't need to check that we have at least
7.9.8 here. I have no idea what in http-push.c broke on versions older
than that.

This does not impact "NO_CURL" setups, as this is in the "else" branch
after that check.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1436,15 +1436,8 @@ else
 	REMOTE_CURL_NAMES = $(REMOTE_CURL_PRIMARY) $(REMOTE_CURL_ALIASES)
 	PROGRAM_OBJS += http-fetch.o
 	PROGRAMS += $(REMOTE_CURL_NAMES)
-	curl_check := $(shell (echo 070908; $(CURL_CONFIG) --vernum | sed -e '/^70[BC]/s/^/0/') 2>/dev/null | sort -r | sed -ne 2p)
-	ifeq "$(curl_check)" "070908"
-		ifndef NO_EXPAT
-			PROGRAM_OBJS += http-push.o
-		else
-			EXCLUDED_PROGRAMS += git-http-push
-		endif
-	else
-		EXCLUDED_PROGRAMS += git-http-push
+	ifndef NO_EXPAT
+		PROGRAM_OBJS += http-push.o
 	endif
 	curl_check := $(shell (echo 072200; $(CURL_CONFIG) --vernum | sed -e '/^70[BC]/s/^/0/') 2>/dev/null | sort -r | sed -ne 2p)
 	ifeq "$(curl_check)" "072200"