Remove macOS version check.

config-scripts/cups-opsys.m4

@@ -1,8 +1,8 @@
 dnl
 dnl Operating system stuff for CUPS.
 dnl
-dnl Copyright 2007-2018 by Apple Inc.
-dnl Copyright 1997-2006 by Easy Software Products, all rights reserved.
+dnl Copyright © 2007-2019 by Apple Inc.
+dnl Copyright © 1997-2006 by Easy Software Products, all rights reserved.
 dnl
 dnl Licensed under Apache License v2.0.  See the file "LICENSE" for more
 dnl information.
@@ -19,12 +19,6 @@ if test "x$host_os_version" = x; then
         host_os_version="0"
 fi
 
-if test "$host_os_name" = darwin -a $host_os_version -lt 120; then
-        AC_MSG_ERROR([Sorry, this version of CUPS requires macOS 10.8 or higher.])
-fi
-
-echo host_os_version=$host_os_version
-
 dnl Determine whether we are cross-compiling...
 if test "$build" = "$host"; then
         # No, build local targets

configure

@@ -2626,12 +2626,6 @@ if test "x$host_os_version" = x; then
         host_os_version="0"
 fi
 
-if test "$host_os_name" = darwin -a $host_os_version -lt 120; then
-        as_fn_error $? "Sorry, this version of CUPS requires macOS 10.8 or higher." "$LINENO" 5
-fi
-
-echo host_os_version=$host_os_version
-
 if test "$build" = "$host"; then
         # No, build local targets
 	LOCALTARGET="local"