depends: fix Boost 1.55 build on GCC 5

Boost assumes variadic templates are always available in GCC 4.4+, but
they aren't since we don't build with -std=c++11.

This applies the patch that fixed the issue in boost 1.57:
https://github.com/boostorg/config/commit/eec808554936ae068b23df07ab54d4dc6302a695

See also: https://svn.boost.org/trac/boost/ticket/10500

depends/packages/boost.mk

@@ -3,7 +3,7 @@ $(package)_version=1_55_0
 $(package)_download_path=http://sourceforge.net/projects/boost/files/boost/1.55.0
 $(package)_file_name=$(package)_$($(package)_version).tar.bz2
 $(package)_sha256_hash=fff00023dd79486d444c8e29922f4072e1d451fc5a4d2b6075852ead7f2b7b52
-$(package)_patches=darwin_boost_atomic-1.patch darwin_boost_atomic-2.patch
+$(package)_patches=darwin_boost_atomic-1.patch darwin_boost_atomic-2.patch gcc_5_no_cxx11.patch
 
 define $(package)_set_vars
 $(package)_config_opts_release=variant=release
@@ -28,6 +28,7 @@ endef
 define $(package)_preprocess_cmds
   patch -p2 < $($(package)_patch_dir)/darwin_boost_atomic-1.patch && \
   patch -p2 < $($(package)_patch_dir)/darwin_boost_atomic-2.patch && \
+  patch -p2 < $($(package)_patch_dir)/gcc_5_no_cxx11.patch && \
   echo "using $(boost_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags) $($(package)_cppflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$(boost_archiver_$(host_os))\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
 endef