emulators/yuzu: silence order warning after 0f5a12706051

$ portlint
[...]
WARN: Makefile: "DEPRECATED" has to appear earlier.
WARN: Makefile: "LIB_DEPENDS" has to appear earlier.
WARN: Makefile: "BUILD_DEPENDS" has to appear earlier.
WARN: Makefile: "TEST_DEPENDS" has to appear earlier.
WARN: Makefile: "FLAVORS" has to appear earlier.