[compiler-rt] Fix interception of crt atoll on win10 CRT.

Summary:
The check-asan-dynamic tests were broken on win10 because the interception
library was not able to hook on some functions.

credits: thanks sebastian marchand to help debugging this on win10.

Reviewers: rnk

Subscribers: chrisha, llvm-commits, dberris

Differential Revision: https://reviews.llvm.org/D25120

llvm-svn: 282904