lots of minor fixes

Rev: src/Makefile.in:1.57
Rev: src/configure.in:1.158
Rev: src/dmalloc.h:1.4
Rev: src/fd_control.c:1.13
Rev: src/fd_control.h:1.2
Rev: src/fdlib.c:1.12
Rev: src/fdlib.h:1.9
Rev: src/main.c:1.41
Rev: src/mapping.c:1.28
Rev: src/pike_memory.c:1.13
Rev: src/stralloc.c:1.27
Rev: src/time_stuff.h:1.7