Add a reproducibility option for building ecodes.c

[ycongal-smile]

ecodes.c currently contains the kernel info of the build machine and the full path of the input*.h headers: This is not reproducible as output can change even is headers content do not. Downstream distributions might package ecodes.c and get non-reproducible output.

To fix this: introduce a --reproducible option in the build:

• in setup.py build_ecodes command
• in underlying genecodes_c.py

Note: These options are disabled by default so no change is expected in current builds.

Here is a sample of the ecodes.c output:

 $ python -m build --config-setting=--build-option='build_ecodes' -n >/dev/null 2>&1; cat src/evdev/ecodes.c |grep Generated
/* Generated on   Linux 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 */
/* Generated from ['/usr/include/linux/input.h', '/usr/include/linux/input-event-codes.h', '/usr/include/linux/uinput.h'] */

 $ python -m build --config-setting=--build-option='build_ecodes --reproducibility' -n >/dev/null 2>&1; cat src/evdev/ecodes.c |grep Generated
/* Generated on   hidden for reproducibility */
/* Generated from ['hidden for reproducibility'] */

[ssieb]

I can see removing the timestamps and kernel version, but not the headers. That's somewhat important info and shouldn't change.

[ycongal-smile]

I should have mentioned that I come from the Yocto project (embedded software), in this cross-compiling environment : the targeted headers are not the system headers and come from a very user specific path (often deep in the home of the user). Writing this path to a file cause us reproducibility issue (hence this PR).