Change default value of QMAKE_LIBS_OPENGL_ES1 to libGLESv1_CM

Change default value of QMAKE_LIBS_OPENGL_ES1 to libGLESv1_CM

The naming convention for these libraries says that libGLES_CM is to be
used when EGL is included while libGLESv1_CM should be used when EGL is
not included. Since we have a seperate variable for libEGL, it
makes sense to have this variable represent the non-EGL version of the
library.

Change-Id: I9147c116da7be4a296a0ebeac39762b46725f10e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>