package/piglit: fix build of GLES tests

GLES tests needs libegl so:
- check for BR2_PACKAGE_HAS_LIBEGL to enable them
- add libegl to PIGLIT_DEPENDENCIES if needed

Fixes:
 - http://autobuild.buildroot.org/results/3c2b7fb1e54dd52a5fd9c1024b8258e02063bd2c

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/piglit/piglit.mk

@@ -53,7 +53,8 @@ else
 PIGLIT_CONF_OPTS += -DPIGLIT_BUILD_GLX_TESTS=OFF
 endif
 
-ifeq ($(BR2_PACKAGE_HAS_LIBGLES),y)
+ifeq ($(BR2_PACKAGE_HAS_LIBEGL)$(BR2_PACKAGE_HAS_LIBGLES),yy)
+PIGLIT_DEPENDENCIES += libegl
 PIGLIT_CONF_OPTS += -DPIGLIT_BUILD_GLES1_TESTS=ON \
 	-DPIGLIT_BUILD_GLES2_TESTS=ON \
 	-DPIGLIT_BUILD_GLES3_TESTS=ON