manpage: remove bogus significant whitespace

Made the first line formatted differently.
vo_opengl: fix regression with opengl:pbo

In the pbo case, mpi was reassigned to a stack pointer, and later
deallocated. Just change the code so it doesn't need to be reassigned.
bootstrap: update waf website and version

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: wm4 <wm4@nowhere>