package/poppler: enable autodetection of openjpeg

This patch enables autodetection for installed openjpeg library.
Previously we were forcing to version 1.

Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/poppler/poppler.mk

@@ -75,7 +75,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_OPENJPEG),y)
 POPPLER_DEPENDENCIES += openjpeg
-POPPLER_CONF_OPTS += --enable-libopenjpeg=openjpeg1
+POPPLER_CONF_OPTS += --enable-libopenjpeg
 else
 POPPLER_CONF_OPTS += --enable-libopenjpeg=none
 endif