* gnu/packages/patches/supercollider-boost-1.70-build-fix.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/audio.scm (supercollider): Update to 3.10.3 and apply the
previous patch to fix build with boost-1.70. Remove outdated
'fix-build-with-boost-1.68 phase.
