Revert "Temporary move __udivdi3 back to LIBC for x86"

This reverts commit bc02fb964a59983521c5f6cf80b1189434952780.

Bug: http://b/26406724
Bug: http://b/26423217
Change-Id: I8e3186fc76502d6818753e5d76a7c145207ed9a3
diff --git a/libc/libc.arm.map b/libc/libc.arm.map
index 9522759..efd1106 100644
--- a/libc/libc.arm.map
+++ b/libc/libc.arm.map
@@ -1414,7 +1414,7 @@
     __swrite; # arm x86 mips
     __swsetup; # arm x86 mips
     __truncdfsf2; # arm
-    __udivdi3; # arm mips
+    __udivdi3; # arm x86 mips
     __udivsi3; # arm
     __unorddf2; # arm
     __unordsf2; # arm