Don't cast memcpy void* arguments.

src/array.c

src/array.h

src/builtin.cmod

src/builtin_functions.c

src/docode.c

src/modules/SANE/sane.c

src/modules/_WhiteFish/resultset.c

src/modules/system/system.c

src/pike_memory.c

src/port.c

src/port.h

src/post_modules/GTK1/source/encode_truecolor.c

src/post_modules/GTK1/source/support.c

src/post_modules/GTK2/source/encode_truecolor.c

src/post_modules/GTK2/source/support.c

src/stralloc.h

src/svalue.c