Define HAVE_LIMITS_H in options.h rather than config.h. #544

Job	Run time
load-targets	5s
analyze (gcc-arm-cortex-m4, gcc-arm, cortex-m4, sudo apt-get update && sudo apt-get install -y gc...	1m 56s
analyze (gcc-arm-cortex-m4-baremetal, gcc-arm, cortex-m4-baremetal, sudo apt-get update && sudo a...	2m 8s
analyze (gcc-arm-cortex-m4-tls12, gcc-arm, cortex-m4-tls12, sudo apt-get update && sudo apt-get i...	1m 51s
analyze (gcc-arm-cortex-m4-min-ecc, gcc-arm, cortex-m4-min-ecc, sudo apt-get update && sudo apt-g...	2m 33s
	8m 33s

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