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Fix gem checks judging unused system gem homes (#1098, #1109) #714

Job	Run time
changes	7s
build windows-latest	4m 1s
gradle 7.6.6 / jdk 17 / agent / windows-latest	4m 54s
gradle 8.14.3 / jdk 21 / hosted / windows-latest	40m 59s
gradle 7.6.6 / jdk 17 / vendor / windows-latest	10m 21s
gradle 8.14.3 / jdk 21 / vendor / windows-latest	12m 10s
gradle 9.8.0 / jdk 21 / vendor / windows-latest	6m 51s
gradle 9.8.0 / jdk 21 / agent / windows-latest	5m 19s
gradle 6.9.4 / jdk 11 / vendor / windows-latest	8m 34s
gradle 6.9.4 / jdk 11 / hosted / windows-latest	30m 19s
gradle 7.6.6 / jdk 17 / hosted / windows-latest	41m 20s
gradle 8.14.3 / jdk 21 / agent / windows-latest	4m 4s
gradle 6.9.4 / jdk 11 / agent / windows-latest	3m 48s
gradle 9.8.0 / jdk 21 / hosted / windows-latest	22m 37s
gradle ${{ matrix.gradle }} / jdk ${{ matrix.java }} / ${{ matrix.mode }} / ${{ matrix.label }}	-1s
	3h 15m 23s