Cast data size to unsigned int (#405) #684

Job	Run time
custom-install-win	2m 3s
default-linux	14s
preset-support-but-not-enough	10m 3s
default-win	2m 31s
min-req	5m 52s
default-linux-with-examples	15s
custom-install-linux	15s
with-hunter	3m 5s
with-libressl	1m 33s
no-pico	11s
with-wolfssl	55s
no-base64	12s
root-hint-install-linux	9s
	27m 18s

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