glew-egl: added README

glew-egl/README

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+Ports that list glew among their dependencies might not work properly on a
+pure-Wayland desktop. This port is identical to the one in the opt repository
+except that it inserts the definition SYSTEM=linux-egl in the call to 'make'.
+The resulting package should allow glew-dependent ports to run as expected.
+Add the following line to /etc/prt-get.aliases if you prefer not to make an
+overlay containing copies of your glew-dependent ports with the "Depends on"
+line changed.
+
+glew-egl: glew