qemu: use PACKAGECONFIG to address libaio/attr/libcap dependencies

Move to using the PACKAGECONFIG mechanism to select configure options
and dependencies. Without this the system will attempt to discover
various dependencies, and sometimes does so incorrectly.

(From OE-Core rev: 8438bbe210de6f565f842d745ccede131fa385db)

Signed-off-by: Ting Liu <b28495@freescale.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu.inc

@@ -84,6 +84,8 @@ do_install_append() {
 # END of qemu-mips workaround
 
 PACKAGECONFIG ??= ""
+PACKAGECONFIG[virtfs] = "--enable-virtfs --enable-attr,--disable-virtfs,libcap attr,"
+PACKAGECONFIG[aio] = "--enable-linux-aio,--disable-linux-aio,libaio,"
 
 # Qemu target will not build in world build for ARM or Mips
 BROKEN_qemuarm = "1"