package/libimxvpuapi: use external waf

This makes libimxvpuapi use the Waf package ditributed in Buildroot,
instead of its own one, as the latter does not support Python3.

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libimxvpuapi/libimxvpuapi.mk

@@ -10,5 +10,6 @@ LIBIMXVPUAPI_LICENSE = LGPL-2.1+
 LIBIMXVPUAPI_LICENSE_FILES = LICENSE
 LIBIMXVPUAPI_DEPENDENCIES = host-pkgconf host-python imx-vpu
 LIBIMXVPUAPI_INSTALL_STAGING = YES
+LIBIMXVPUAPI_NEEDS_EXTERNAL_WAF = YES
 
 $(eval $(waf-package))