waf examples: how to modify linker flags/how to process generated exe.

[Sebastian Huber]

Hello Karel,

a post-link step (for example a transformation of the ELF file into a 
boot loader image) is currently not supported by the new build system. 
For this the idea is to let the BSP optionally provide a "post-link" 
command line tool (a shell script for example) and then use a mechanism 
described here:

https://waf.io/blog/2016/09/waf-strip-binaries.html

Changing linker flags for a BSP is the easy part, see for example:

spec/build/bsps/i386/pc386/optrelocaddr.yml

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