Always build libEGL and libGLESv2 as shared libraries. They do not work as static libraries so there is no point in parametrizing the library type.
Review URL: http://codereview.appspot.com/810045

git-svn-id: https://angleproject.googlecode.com/svn/trunk@104 736b8ea6-26fd-11df-bfd4-992fa37f6226