Fix still reachable leaks in loader tests. (#234) #268

Job	Run time
macos-gcc (9, ON, Xcode, 99)	1m 13s
macos-gcc (9, ON, Xcode, 11)	3m 48s
macos-gcc (9, ON, Ninja Multi-Config, 99)	54s
macos-gcc (9, ON, Ninja Multi-Config, 11)	48s
macos-gcc (9, OFF, Xcode, 99)	1m 21s
macos-gcc (9, OFF, Xcode, 11)	1m 18s
macos-gcc (9, OFF, Ninja Multi-Config, 99)	50s
macos-gcc (9, OFF, Ninja Multi-Config, 11)	47s
macos-gcc (10, ON, Xcode, 99)	1m 0s
macos-gcc (10, ON, Xcode, 11)	59s
macos-gcc (10, ON, Ninja Multi-Config, 99)	28s
macos-gcc (10, ON, Ninja Multi-Config, 11)	29s
macos-gcc (10, OFF, Xcode, 99)	58s
macos-gcc (10, OFF, Xcode, 11)	58s
macos-gcc (10, OFF, Ninja Multi-Config, 99)	28s
macos-gcc (10, OFF, Ninja Multi-Config, 11)	28s
macos-gcc (11, ON, Xcode, 99)	57s
macos-gcc (11, ON, Xcode, 11)	58s
macos-gcc (11, ON, Ninja Multi-Config, 99)	32s
macos-gcc (11, ON, Ninja Multi-Config, 11)	31s
macos-gcc (11, OFF, Xcode, 99)	59s
macos-gcc (11, OFF, Xcode, 11)	1m 0s
macos-gcc (11, OFF, Ninja Multi-Config, 99)	29s
macos-gcc (11, OFF, Ninja Multi-Config, 11)	36s
	22m 49s

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