Change in coreboot[master]: util/cbfstool/flashmap/fmap.c: fix fmaptool endianness bugs on BE

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Idwer Vollering, Stefan Reinauer, Julius Werner, Arthur Heymans, Krystian Hebel, Timothy Pearson.
Sergii Dmytruk has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55039 )

Change subject: util/cbfstool/flashmap/fmap.c: fix fmaptool endianness bugs on BE
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Patch Set 9:

(2 comments)

Patchset:

PS9: 
Added -D_DEFAULT_SOURCE to util/ifdtool/Makefile.inc instead of defining it in code.

File util/cbfstool/flashmap/fmap.c:

https://review.coreboot.org/c/coreboot/+/55039/comment/58ea3cd6_4b42df56 
PS7, Line 7:  * It is required for endianness converting functions.
> Then why not add it to the ifdtool Makefile? I think that would be more appropriate than this.

Moved it there.