[tbs_plugins/Makefile] Explicitely made lst.o an intermediate file.

Probably not necessary but it's one less file hanging around.
[tbs_plugins/sma_walsh] Added parentheses to avoid a GCC warning.

This warned about unclear intended order of operations, specifically the
warning was:

sma_walsh.c: In function 'load_pattern_walsh_cmd':
sma_walsh.c:166: warning: suggest parentheses around arithmetic in operand of '|'

Placing parentheses around the operand removed the warning.