AOSP: Add gbm-backends-path meson definition
After commit 68902822 ("gbm: Support dynamically loading named backends")
libgbm will search for external backends at specified directory.
Use "/vendor/lib{64}/gbm" directory for backends on Android.
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After commit 68902822 ("gbm: Support dynamically loading named backends")
libgbm will search for external backends at specified directory.
Use "/vendor/lib{64}/gbm" directory for backends on Android.