i965: Silence unused parameter warnings in intel_fbo.c

i965: Silence unused parameter warnings in intel_fbo.c

intel_fbo.c: In function 'intel_alloc_window_storage':
intel_fbo.c:415:48: warning: unused parameter 'ctx' [-Wunused-parameter]
 intel_alloc_window_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
                                                ^
intel_fbo.c: In function 'intel_nop_alloc_storage':
intel_fbo.c:428:74: warning: unused parameter 'rb' [-Wunused-parameter]
 intel_nop_alloc_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
                                                                          ^
intel_fbo.c:429:32: warning: unused parameter 'internalFormat' [-Wunused-parameter]
                         GLenum internalFormat, GLuint width, GLuint height)
                                ^
intel_fbo.c:429:55: warning: unused parameter 'width' [-Wunused-parameter]
                         GLenum internalFormat, GLuint width, GLuint height)
                                                       ^
intel_fbo.c:429:69: warning: unused parameter 'height' [-Wunused-parameter]
                         GLenum internalFormat, GLuint width, GLuint height)
                                                                     ^
intel_fbo.c: In function 'intel_blit_framebuffer_with_blitter':
intel_fbo.c:790:61: warning: unused parameter 'filter' [-Wunused-parameter]
                                     GLbitfield mask, GLenum filter)
                                                             ^

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>