[Buildroot] [Bug 1927] Bump file to 5.03 and migrate to autotargets

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=1927

--- Comment #4 from Gustavo Zacarias <gustavo at zacarias.com.ar>  ---
Seen that when trying to build 5.04 so i went to 5.03 to avoid the pain (yeah i
was lazy).
I'll give it a look tomorrow.

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