libgltf: add boost to DEPENDS
libgltf: add boost to DEPENDS

| checking for boost/property_tree/ptree.hpp... no
| configure: error: Required boost headers not found. Install boost >= 1.41.0
| Configure failed. The contents of all config.log files follows to aid debugging
| WARNING: /home/a.mueller/tmp/oe-core-glibc/work/cortexa9t2hf-vfp-neon-angstrom-linux-gnueabi/libgltf/0.0.2-r0/temp/run.do_configure.14417:1 exit 1 from
|   exit 1
| ERROR: oe_runconf failed
| ERROR: Function failed: do_configure (log file is located at /home/a.mueller/tmp/oe-core-glibc/work/cortexa9t2hf-vfp-neon-angstrom-linux-gnueabi/libgltf/0.0.2-r0/temp/log.do_conf

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@googlemail.com>

schnitzeltony/meta-office,schnitzeltony/meta-libreoffice