mesa/st: Make st_convert_image(_from_unit) declaration match definition
Pointed out by GCC 13:
../src/mesa/state_tracker/st_atom_image.c:51:1: warning: conflicting types for ‘st_convert_image’ due to enum/integer mismatch; have ‘void(const struct st_context *, const struct gl_image_unit *, struct pipe_image_view *, enum gl_access_qualifier)’ [-Wenum-int-mismatch]
51 | st_convert_image(const struct st_context *st, const struct gl_image_unit *u,
| ^~~~~~~~~~~~~~~~
In file included from ../src/mesa/state_tracker/st_atom_image.c:41:
../src/mesa/state_tracker/st_texture.h:242:1: note: previous declaration of ‘st_convert_image’ with type ‘void(const struct st_context *, const struct gl_image_unit *, struct pipe_image_view *, unsigned int)’
242 | st_convert_image(const struct st_context *st, const struct gl_image_unit *u,
| ^~~~~~~~~~~~~~~~
../src/mesa/state_tracker/st_atom_image.c:134:1: warning: conflicting types for ‘st_convert_image_from_unit’ due to enum/integer mismatch; have ‘void(const struct st_context *, struct pipe_image_view *, GLuint, enum gl_access_qualifier)’ {aka ‘void(const struct st_context *, struct pipe_image_view *, unsigned int, enum gl_access_qualifier)’} [-Wenum-int-mismatch]
134 | st_convert_image_from_unit(const struct st_context *st,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
../src/mesa/state_tracker/st_texture.h:246:1: note: previous declaration of ‘st_convert_image_from_unit’ with type ‘void(const struct st_context *, struct pipe_image_view *, GLuint, unsigned int)’ {aka ‘void(const struct st_context *, struct pipe_image_view *, unsigned int, unsigned int)’}
246 | st_convert_image_from_unit(const struct st_context *st,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22517>