ueventd: convert mkdir_recursive() to std::string

Bug: 36250207

Test: Boot bullhead
Test: Boot sailfish, observe no boot time regression
Test: init unit tests

Change-Id: I5a2ac369d846e044230b709fd07eb21ad12d47bb
diff --git a/init/Android.mk b/init/Android.mk
index dbbf40a..7e9b613 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -148,8 +148,9 @@
     util_test.cpp \
 
 LOCAL_SHARED_LIBRARIES += \
-    libcutils \
     libbase \
+    libcutils \
+    libselinux \
 
 LOCAL_STATIC_LIBRARIES := libinit
 LOCAL_SANITIZE := integer