[sanitizer] Allow dlopen/dlclose interception to be disabled from cmake

Summary:
dlopen and dlclose interception are broken when RUNPATH is used:
https://llvm.org/bugs/show_bug.cgi?id=27790

Reviewers: kutuzov.viktor.84, samsonov, dvyukov, eugenis, kcc

Subscribers: kcc, filcab, kubabrecka, compnerd, llvm-commits

Differential Revision: http://reviews.llvm.org/D20333

llvm-svn: 269947