* gnu/packages/networking.scm (sc-im): Update to 0.8.3.
[arguments]: Use modern style, patch bash path, and enable tests.
[native-inputs]: Add bash-minimal and valgrind.
* gnu/packages/spreadsheet.scm (visidata): Update to 2.8.
[inputs, native-inputs]: Migrate inputs to new style.
Signed-off-by: Leo Famulari <leo@famulari.name>