tools: provide pkg-config file for libxenblktapctl

In order to be able to use pkg-config for obtaining linker- and
compiler-flags provide a xenblktapctl.pc file.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

.gitignore

@@ -108,6 +108,7 @@ tools/libs/foreignmemory/headers.chk
 tools/libs/foreignmemory/xenforeignmemory.pc
 tools/libs/devicemodel/headers.chk
 tools/libs/devicemodel/xendevicemodel.pc
+tools/blktap2/control/xenblktapctl.pc
 tools/blktap2/daemon/blktapctrl
 tools/blktap2/drivers/img2qcow
 tools/blktap2/drivers/lock-util