(Build) Fix checks for gles20, glyphcache install folder

(Build) Fix checks for gles20, glyphcache install folder

Tizen Common does not have "gles20", but only "glesv2" and
"egl" in all repos. We have a macro to replace it in the
specfile, but not the autoconf files. Fixing.

The glyphcache install folder seems to have changed in
latest releases ("/opt/usr" to "/usr"). Fixing.

Use the %configure macro instead of "./configure". Simplify
the specfile by using a conditional variable.

Signed-off-by: Manuel Bachmann <manuel.bachmann@open.eurogiciel.org>
Change-Id: Icc88ee08b2f373be92e1a9be0f85656da032f99e