`ICERR_*` constants should be typed as `LRESULT`

[AArnott]

From the ICClose function documentation it appears that constants such as ICERR_OK are expected to be typed as LRESULT. In the metadata today, these ICERR_* constants are typed as int.

[riverar]

Note taking, ignore.

Naked integer constants in vfh.h

#ifndef ICERR_OK
#define ICERR_OK                0L
#define ICERR_DONTDRAW          1L
#define ICERR_NEWPALETTE        2L
#define ICERR_GOTOKEYFRAME  3L
#define ICERR_STOPDRAWING   4L

#define ICERR_UNSUPPORTED      -1L
#define ICERR_BADFORMAT        -2L
#define ICERR_MEMORY           -3L
#define ICERR_INTERNAL         -4L
#define ICERR_BADFLAGS         -5L
#define ICERR_BADPARAM         -6L
#define ICERR_BADSIZE          -7L
#define ICERR_BADHANDLE        -8L
#define ICERR_CANTUPDATE       -9L
#define ICERR_ABORT        -10L
#define ICERR_ERROR            -100L
#define ICERR_BADBITDEPTH      -200L
#define ICERR_BADIMAGESIZE     -201L

#define ICERR_CUSTOM           -400L    // errors less than ICERR_CUSTOM...
#endif