libselinux is dynamically linked from init

init is now dynamically linked to libselinux. This gives us about 100KB
extra space, which is valuable in the recovery partition.

Bug: 63673171
Test: m -j
Test: adb reboot recovery
Change-Id: I72c4f886cbbb9ce54f8221f05547f5b9f0e1adb0
diff --git a/init/Android.mk b/init/Android.mk
index da27a73..a81a0f6 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -61,7 +61,6 @@
     libseccomp_policy \
     libcrypto_utils \
     libsparse \
-    libselinux \
     libprocessgroup \
     libavb \
     libkeyutils \
@@ -76,6 +75,7 @@
     libcrypto \
     libdl \
     libz \
+    libselinux \
 
 ifneq ($(BOARD_BUILD_SYSTEM_ROOT_IMAGE),true)
 # init is static executable for non-system-as-root devices, because the dynamic linker