android: util/format: fix generated sources rules
Changes are necessary after commit 84ed2d09 ("util/format: expose generated format packing functions through a header") because script for format/u_format_pack.h has different commandline compared to existing pattern
Generated sources rules are ported from meson
Fixes: 84ed2d09 ("util/format: expose generated format packing functions through a header") Signed-off-by: Mauro Rossi issor.oruam@gmail.com