Move install to separate module

Build libinstall as a shared library. Also drop the dependency on the
global variables in common.h.

Test: unit tests pass, sideload an OTA
Change-Id: I30a20047768ce00689fc0e7851c1c5d712a365a0
diff --git a/otautil/Android.bp b/otautil/Android.bp
index 41018dd..b4936c0 100644
--- a/otautil/Android.bp
+++ b/otautil/Android.bp
@@ -42,12 +42,23 @@
                 "dirutil.cpp",
                 "mounts.cpp",
                 "parse_install_logs.cpp",
+                "roots.cpp",
                 "sysutil.cpp",
                 "thermalutil.cpp",
             ],
 
+            include_dirs: [
+                "system/vold",
+            ],
+
+            static_libs: [
+                "libfstab",
+            ],
+
             shared_libs: [
                 "libcutils",
+                "libext4_utils",
+                "libfs_mgr",
                 "libselinux",
             ],
         },