Makefile: HP-UX 10.20 portability fixes

HP-UX 10.20 has no pread definition, the inline keyword doesn't work,
and has no inet_ntop/inet_pton definitions.

Signed-off-by: Gary V. Vaughan <gary@thewrittenword.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -988,6 +988,14 @@ ifeq ($(uname_S),HP-UX)
 		NO_INET_NTOP = YesPlease
 		NO_INET_PTON = YesPlease
 	endif
+	ifeq ($(uname_R),B.10.20)
+		# Override HP-UX 11.x setting:
+		INLINE =
+		SOCKLEN_T = size_t
+		NO_PREAD = YesPlease
+		NO_INET_NTOP = YesPlease
+		NO_INET_PTON = YesPlease
+	endif
 	GIT_TEST_CMP = cmp
 endif
 ifeq ($(uname_S),Windows)