[Bug middle-end/82569] [8 regression] failure in 177.mesa cpu2000 test case after r253530

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82569

--- Comment #4 from seurer at gcc dot gnu.org ---
extern void gl_write_texture_span( GLcontext *ctx,
                                   GLuint n, GLint x, GLint y, GLdepth z[],
                                   GLfloat s[], GLfloat t[], GLfloat u[],
                                   GLfloat lambda[],
                                   GLubyte red[], GLubyte green[],
                                   GLubyte blue[], GLubyte alpha[],
                                   GLenum primitive );