tools/bc: update to 1.07

tools/bc: update to 1.07

Update to latest version. Replace mirror with @GNU/bc.

Manually refresh:
- 001-no_doc.patch

Add patch found here:
https://github.com/fivepiece/gnu-bc/commit/26f275502dd28114e78bc098fed81acde1d86d62
as 002-fix-libmath.patch to fix compilation.

Add another patch found here:
https://github.com/archlinux/svntogit-packages/commit/55b26eda94e1a9ff726ac458fccab5f3f3ad2114
as 003-bc-fix-hang.patch to prevent a hang when building the kernel.

Signed-off-by: Nick Hainke <vincent@systemli.org>