Fixed a few warnings.

Rev: src/array.c:1.84
Rev: src/array.h:1.28
Rev: src/fdlib.c:1.38
Rev: src/interpret.c:1.164
Rev: src/language.yacc:1.207
Rev: src/modules/MIME/mime.c:1.25
Rev: src/modules/_Crypto/crypto.c:1.37
Rev: src/modules/call_out/call_out.c:1.38
Rev: src/modules/files/efuns.c:1.83
Rev: src/modules/files/file.c:1.187
Rev: src/pike_memory.c:1.80
Rev: src/pike_memory.h:1.23