subprojects: add wrap file for libblkio

This allows building libblkio at the same time as QEMU, if QEMU is
configured with --enable-blkio --enable-download.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

subprojects/libblkio.wrap

@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://gitlab.com/libblkio/libblkio
+revision = f84cc963a444e4cb34813b2dcfc5bf8526947dc0
+
+[provide]
+blkio = libblkio_dep