Makefile: SunOS 5.6 portability fix

Although configure takes care of most of this, set some default values
for Solaris 2.6 (aka SunOS-5.6) to ensure git compiles even when
configure is not used to build it.

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

Makefile

@@ -812,6 +812,18 @@ ifeq ($(uname_S),SunOS)
 	NO_MKDTEMP = YesPlease
 	NO_MKSTEMPS = YesPlease
 	NO_REGEX = YesPlease
+	ifeq ($(uname_R),5.6)
+		SOCKLEN_T = int
+		NO_HSTRERROR = YesPlease
+		NO_IPV6 = YesPlease
+		NO_SOCKADDR_STORAGE = YesPlease
+		NO_UNSETENV = YesPlease
+		NO_SETENV = YesPlease
+		NO_STRLCPY = YesPlease
+		NO_C99_FORMAT = YesPlease
+		NO_STRTOUMAX = YesPlease
+		GIT_TEST_CMP = cmp
+	endif
 	ifeq ($(uname_R),5.7)
 		NEEDS_RESOLV = YesPlease
 		NO_IPV6 = YesPlease