package/poppler: add boost optional dependency

boost is an optional dependency which is enabled by default since
version 0.80.0 and
https://github.com/freedesktop/poppler/commit/355fd8d58ca0209284fe568b3add28f207e995c1

There is no cmake option to enable or disable this dependency

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 497f989d7595a1c801a587e77d508ec3fa6edf0f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/poppler/poppler.mk

@@ -27,6 +27,10 @@ ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 POPPLER_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
 endif
 
+ifeq ($(BR2_PACKAGE_BOOST),y)
+POPPLER_DEPENDENCIES += boost
+endif
+
 ifeq ($(BR2_PACKAGE_JPEG),y)
 POPPLER_DEPENDENCIES += jpeg
 POPPLER_CONF_OPTS += -DENABLE_DCTDECODER=libjpeg -DWITH_JPEG=ON