Fix[hxtorch,pynn-brainscales] dependency on boost

In spack 0.18 boost default libraries changed, see [0].

[0] https://github.com/spack/spack/blob/v0.18.1/var/spack/repos/builtin/packages/boost/package.py#L77

packages/hxtorch/package.py

@@ -3,6 +3,7 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 from spack import *
+from spack.pkg.builtin.boost import Boost
 import os
 
 
@@ -21,6 +22,7 @@ class Hxtorch(WafPackage):
     # host software dependencies
     depends_on('bitsery', type=('build', 'link', 'run'))
     depends_on('binutils+gold+ld+plugins', type=('build', 'link', 'run')) # specialize
+    depends_on(Boost.with_default_variants)
     depends_on('boost@1.69.0: +graph+icu+mpi+python+numpy+coroutine+context cxxstd=17', type=('build', 'link', 'run')) # specialize boost (non-clingo, type=('build', 'link', 'run'))
     depends_on('cereal', type=('build', 'link', 'run'))
     depends_on('cppcheck', type=('build', 'link', 'run'))

packages/pynn-brainscales/package.py

@@ -3,6 +3,7 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 from spack import *
+from spack.pkg.builtin.boost import Boost
 
 
 class PynnBrainscales(WafPackage):
@@ -19,6 +20,7 @@ class PynnBrainscales(WafPackage):
     # host software dependencies
     depends_on('bitsery', type=('build', 'link', 'run'))
     depends_on('binutils+gold+ld+plugins', type=('build', 'link', 'run')) # specialize
+    depends_on(Boost.with_default_variants)
     depends_on('boost@1.69.0: +graph+icu+mpi+python+numpy+coroutine+context cxxstd=17', type=('build', 'link', 'run')) # specialize boost (non-clingo, type=('build', 'link', 'run'))
     depends_on('cereal', type=('build', 'link', 'run'))
     depends_on('cppcheck', type=('build', 'link', 'run'))