* gnu/packages/engineering.scm (fastcap): New variable. (broken-tarball-fetch): New function. Suggested by Ludovic Courtès <ludo@gnu.org>. * gnu/packages/patches/fastcap-mulGlobal.patch, gnu/packages/patches/fastcap-mulSetup.patch: New files. * gnu-system.am (dist_patch_DATA): Add them.