Add atf pkg-config files from the vendor branch.

These were originally deleted by mistake (because they were not yet being
installed) and are actually necessary.

This should have been part of r260576 but I missed committing this
directory.

MFC after:	5 days

contrib/atf/FREEBSD-Xlist

@@ -8,7 +8,6 @@ Makefile*
 aclocal.m4
 admin/
 atf-*/atf-*.m4
-atf-*/atf-*.pc.in
 atf-config/
 atf-report/
 atf-run/

contrib/atf/atf-c++/atf-c++.pc.in

@@ -0,0 +1,11 @@
+# ATF pkg-config file
+
+cxx=__CXX__
+includedir=__INCLUDEDIR__
+libdir=__LIBDIR__
+
+Name: atf-c++
+Description: Automated Testing Framework (C++ binding)
+Version: __ATF_VERSION__
+Cflags: -I${includedir}
+Libs: -L${libdir} -latf-c++ -latf-c

contrib/atf/atf-c/atf-c.pc.in

@@ -0,0 +1,11 @@
+# ATF pkg-config file
+
+cc=__CC__
+includedir=__INCLUDEDIR__
+libdir=__LIBDIR__
+
+Name: atf-c
+Description: Automated Testing Framework (C binding)
+Version: __ATF_VERSION__
+Cflags: -I${includedir}
+Libs: -L${libdir} -latf-c

contrib/atf/atf-sh/atf-sh.pc.in

@@ -0,0 +1,8 @@
+# ATF pkg-config file
+
+exec_prefix=__EXEC_PREFIX__
+interpreter=${exec_prefix}/bin/atf-sh
+
+Name: atf-sh
+Description: Automated Testing Framework (POSIX shell binding)
+Version: __ATF_VERSION__