Load radare2 plugins from the iaito plugins directory too #633

Job	Run time
acr-linux-r2git	6m 42s
acr-linux	4m 46s
acr-macos-x64	8m 14s
acr-macos-m1	3m 13s
meson (ubuntu-24.04, 3.8.x, true, default, default)	8m 55s
w64-meson	8m 54s
meson (ubuntu-22.04, 3.8.x, true, default, default)	6m 32s
meson (ubuntu-20.04, 3.8.x, true, default, default)	6m 3s
check_release	0s
release	0s
	53m 19s

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