Make PNG test depend on PNG codec

Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit f0f54c297f)
14 years ago · bb71141450
--- a/configure
+++ b/configure
@@ -1487,6 +1487,7 @@ test_deps _encoder _decoder                                             \
    pbm=pbmpipe                                                         \
    pcx                                                                 \
    pgm="pgm pgmpipe"                                                   \
    png                                                                 \
    ppm="ppm ppmpipe"                                                   \
    rawvideo="rgb yuv"                                                  \
    roq                                                                 \