meson_options: Use libGLESv2.so.2 for COGL_DRIVER=gles2, not libGLESv2.so
The former is present on any system that supports OpenGL|ES 2. The latter
is just provided in developer packages. Since we access the library via
g_module_open
it's safe to just rely on libGLESv2.so.2
.
Closes: #1282 (closed)