wininet: Fix HTTP_EncodeBasicAuth by passing an out buffer to the second set of character set conversion calls.

msvcrt: If we're at EOF in the buffer and we have pattern %n in format string we should not count the EOF in the total.

wined3d: Add a glsl_src_param_t type, pass it to shader_glsl_add_src_param() instead of three separate character arrays.

wined3d: Add a glsl_dst_param_t type, pass it to shader_glsl_add_dst_param() instead of three separate character arrays.