Allow execute on mounted ASEC and OBB containers

This allows us to place shared libraries in these containers which may
only be loaded if they are executable.

Change-Id: I78fa9ab6d5c58ec8b98c40004da72aebc0aade2a
diff --git a/Fat.cpp b/Fat.cpp
index 7a86aac..4754c66 100644
--- a/Fat.cpp
+++ b/Fat.cpp
@@ -93,14 +93,15 @@
 }
 
 int Fat::doMount(const char *fsPath, const char *mountPoint,
-                 bool ro, bool remount, int ownerUid, int ownerGid,
-                 int permMask, bool createLost) {
+                 bool ro, bool remount, bool executable,
+                 int ownerUid, int ownerGid, int permMask, bool createLost) {
     int rc;
     unsigned long flags;
     char mountData[255];
 
-    flags = MS_NODEV | MS_NOEXEC | MS_NOSUID | MS_DIRSYNC;
+    flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
 
+    flags |= (executable ? 0 : MS_NOEXEC);
     flags |= (ro ? MS_RDONLY : 0);
     flags |= (remount ? MS_REMOUNT : 0);