Emulate 96-bit integers when parsing INTEGER token #375

Job	Run time
bootstrap-pnut-sh (bash)	1m 26s
bootstrap-bash-2_05a	27m 9s
bootstrap-pnut-sh (dash)	1m 52s
bootstrap-pnut-exe (bash, i386_linux)	4m 12s
bootstrap-pnut-sh (ksh)	48s
bootstrap-pnut-sh-with-pnut-exe (i386_linux)	14s
bootstrap-pnut-exe (bash, x86_64_linux)	4m 7s
bootstrap-pnut-sh (mksh)	17m 28s
bootstrap-pnut-sh-with-pnut-exe (x86_64_linux)	9s
bootstrap-pnut-exe (bash, x86_64_mac)	3m 20s
bootstrap-pnut-sh (yash)	1m 45s
build-without-warnings	58s
bootstrap-pnut-sh-with-pnut-exe (x86_64_mac)	18s
bootstrap-pnut-sh (zsh)	14m 57s
bootstrap-pnut-exe (dash, i386_linux)	10m 34s
bootstrap-pnut-exe (dash, x86_64_linux)	11m 42s
catch-bad-whitespace	4s
bootstrap-pnut-exe (dash, x86_64_mac)	7m 54s
compile-in-safe-mode	13s
pnut-variants-run (reader)	20s
bootstrap-pnut-exe (ksh, i386_linux)	1m 58s
pnut-variants-run (tokenizer)	1m 7s
bootstrap-pnut-exe (ksh, x86_64_linux)	1m 55s
tests-exe (i386_linux, ubuntu-latest)	10s
pnut-variants-run (parser)	47s
tests-exe (x86_64_linux, ubuntu-latest)	13s
tests-exe (x86_64_mac, macos-latest)	13s
bootstrap-pnut-exe (ksh, x86_64_mac)	1m 20s
tests-shell (bash)	19s
tests-shell (dash)	17s
tests-shell (ksh)	1m 14s
tests-shell (mksh)	1m 59s
tests-shell (yash)	2m 2s
tests-shell (zsh)	31s
success-message	1s
	2h 3m 36s

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