Don't prune $(OUT_DIR) from findleaves.py

Pruning $(OUT_DIR) can be overaggressive if $(OUT_DIR) matches the name
of any directory in the source tree that contains Android.mk files.
Pruning $(OUT_DIR) is no longer necessary, as one of the first things
the build system does is put an empty Android.mk file in there to avoid
recursing into it.

Bug: 31941856
Test: m -j OUT_DIR=angler
Change-Id: I7c5e95816f35bd5906845716d56cca76de7fa1ad
diff --git a/core/config.mk b/core/config.mk
index da4784f..07e9b3c 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -148,7 +148,7 @@
 
 # Pruned directory options used when using findleaves.py
 # See envsetup.mk for a description of SCAN_EXCLUDE_DIRS
-FIND_LEAVES_EXCLUDES := $(addprefix --prune=, $(OUT_DIR) $(SCAN_EXCLUDE_DIRS) .repo .git)
+FIND_LEAVES_EXCLUDES := $(addprefix --prune=, $(SCAN_EXCLUDE_DIRS) .repo .git)
 
 # The build system exposes several variables for where to find the kernel
 # headers: