python3: rename patches to the new convention

Note that we don't use completely sequential numbers, because patches
below 100 are used to address cross-compilation issues in Python 3,
while patches above 100 are used to make more Python 3 modules
configurable.

[Thomas: fixup commit log.]

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>