Improved cast.

src/builtin.cmod

src/error.c

src/errors.h

src/modules/Gmp/mpf.cmod

src/modules/Gmp/mpq.cmod

src/modules/Gmp/mpz_glue.c

src/modules/Image/colors.c

src/modules/Image/colortable.c

src/modules/Image/encodings/xcf.c

src/modules/Image/image.c

src/modules/Image/layers.c

src/modules/Java/jvm.c

src/modules/Java/module.pmod.in

src/modules/Math/math_matrix.c

src/modules/Math/matrix_code.h

src/modules/Oracle/oracle.c

src/modules/_Stdio/stat.c

src/modules/_WhiteFish/resultset.c

src/modules/system/memory.c

src/pike_types.c