tree 042c545726540a688c1a63d1b1e85c3fad090233
parent c22ef3b2e342bdfe3140b7e94879996d0e18c95b
author Jeremy Maitin-Shepard <jbms@google.com> 1664746679 -0700
committer Cosmin Truta <ctruta@gmail.com> 1675869052 +0200

cmake: Rename the custom targets to have the png_ prefix

This avoids taget namespace pollution when including libpng as a
sub-project.

Signed-off-by: Cosmin Truta <ctruta@gmail.com>