fix implicit int return types with gcc 14. This fixes the following build failure: . ./lib/pwm_searchPFF.c:303:1: error: return type defaults to ‘int’ [-Wimplicit-int] 303 | get_sequence(fp,seq_id,sequence) | ^~~~~~~~~~~~ ./lib/pwm_searchPFF.c:414:1: error: return type defaults to ‘int’ [-Wimplicit-int] 414 | best_pull(pargs,pbase,pstrand,pscore) | ^~~~~~~~~
