fix nuttx master build after libc local changes

[trns1997]

We need to manually select LIBC_LOCALE due to this commit in nuttx: apache/nuttx@6ce6af9

[github-actions]

File	Coverage	Lines	Branches
All files	84%	86%	83%	✅
lib/include/kickcat/Error.h	87%	91%	83%	✅
lib/include/kickcat/SBufQueue.h	80%	98%	63%	✅
lib/master/include/kickcat/Bus.h	71%	100%	42%	❌
lib/master/src/Bus.cc	82%	85%	80%	✅
lib/master/src/CoE.cc	79%	87%	72%	✅
lib/master/src/Link.cc	98%	100%	97%	✅
lib/master/src/Prints.cc	95%	95%	95%	✅
lib/slave/src/AbstractESC.cc	90%	100%	81%	✅
lib/slave/src/AbstractEmulatedEEPROM.cc	0%	0%	0%	❌
lib/slave/src/ESMStates.cc	94%	99%	88%	✅
lib/slave/src/ESM.cc	92%	93%	90%	✅
lib/slave/src/PDO.cc	86%	92%	80%	✅
lib/slave/src/EEPROM/EEPROM_factory.cc	0%	0%	100%	❌
lib/slave/src/ESC/EmulatedESC.cc	53%	60%	46%	❌
lib/slave/src/slave/Slave.cc	0%	0%	0%	❌
lib/src/Frame.cc	87%	92%	82%	✅
lib/src/Mailbox.cc	64%	71%	56%	❌
lib/src/SIIParser.cc	93%	95%	91%	✅
lib/src/protocol.cc	95%	94%	97%	✅
lib/src/CoE/EsiParser.cc	90%	93%	87%	✅
lib/src/CoE/OD.cc	99%	99%	100%	✅
lib/src/CoE/mailbox/request.cc	78%	83%	74%	✅
lib/src/CoE/mailbox/response.cc	93%	97%	88%	✅
lib/src/EoE/protocol.cc	0%	0%	0%	❌

Minimum allowed coverage is 75%

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