Explicitly set CXXSTD to c++11 for old C++ code using std::auto_ptr<>.

GCC 12 defaults to C++17 which removes (not just deprecates)
std::auto_ptr<>.  Trying to use CXXSTD of c++03 doesn't work with
libc++ headers, but c++11 does.

Reviewed by:	brooks, imp, emaste
Differential Revision:	https://reviews.freebsd.org/D37531

lib/atf/Makefile.inc

@@ -28,3 +28,6 @@
 CFLAGS+=	-DHAVE_CONFIG_H
 
 WARNS?=		3
+
+# Permit use of auto_ptr for compilers defaulting to C++17 or later
+CXXSTD=		c++11

lib/liblutok/Makefile

@@ -22,5 +22,6 @@ SHLIB_MAJOR=	0
 
 # lutok uses auto_ptr
 CFLAGS+=	-Wno-deprecated-declarations
+CXXSTD=		c++11
 
 .include <bsd.lib.mk>

libexec/atf/atf-check/Makefile

@@ -41,6 +41,7 @@ CFLAGS+=	-DATF_SHELL='"/bin/sh"'
 
 # Silence warnings about usage of deprecated std::auto_ptr
 CXXWARNFLAGS+=	-Wno-deprecated-declarations
+CXXSTD=		c++11
 
 LIBADD=		atf_cxx
 

usr.bin/kyua/Makefile

@@ -37,6 +37,7 @@ CFLAGS+=	-I${SRCTOP}/contrib/lutok/include
 CFLAGS+=	-I${SRCTOP}/contrib/sqlite3
 # kyua uses auto_ptr
 CFLAGS+=	-Wno-deprecated-declarations
+CXXSTD=		c++11
 CFLAGS+=	-DHAVE_CONFIG_H
 
 # We compile the kyua libraries as part of the main executable as this saves