bc: bump version to 1.06.95

The current version of bc being used (1.06) is from 2000 and contains a
serious bug causing it to segfault when the math library is used, so bump to
the latest alpha release, which is also 9 years old.

Also include two fixes for Debian (https://packages.debian.org/jessie/bc

)

- A patch to fix array initialization by Phul Nelson
- A patch to get bc to notice I/O errors by Ian Jackson

[Peter: fixup white space and tweak commit message]
Signed-off-by: Robert Sohn <grepper@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>