Narrow scope of loop variables.

src/cdf_read.c

src/cdf_write.c

src/gaussian_latitudes.c

src/grid.c

src/make_fint.c

src/stream.c

src/stream_cdf_i.c

src/stream_gribapi.c

src/varscan.c

src/vlist.c

src/vlist_var.c

src/vlist_var_key.c