ruby_defint.m4: variable names must not contain spaces #711

Job	Run time
make (test-bundled-gems)	23m 5s
make (check, cppflags=-DVM_CHECK_MODE)	10m 12s
make (check, i686)	12m 37s
make (check, --enable-shared --enable-load-relative)	12m 59s
make (check, ubuntu-24.04-arm, capi)	7m 8s
make (test-bundler-parallel, 50)	31m 4s
make (check, ubuntu-24.04, capi)	11m 33s
make (check, --disable-yjit)	8m 26s
make-ibm	0s
Ubuntu result	2s
	1h 57m 6s

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