The targets `libGLESv2` and `libEGL` are no longer public to the root cmake list.
Just move these copy ops into the subdirectory cmake rules without the PVR condition - the copy is cheap enough to do whether we're building PVR or not.

Bug: b/145758253
Change-Id: Ic28331e3797c78e4910332fce934c06c132c3aa8
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43710
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>