[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

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@269947 91177308-0d34-0410-b5e6-96231b3b80d8

Author: fjricci

lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -280,8 +280,12 @@
 #define SANITIZER_INTERCEPT_OBSTACK SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_FFLUSH SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_FCLOSE SI_NOT_WINDOWS
+
+#ifndef SANITIZER_INTERCEPT_DLOPEN_DLCLOSE
 #define SANITIZER_INTERCEPT_DLOPEN_DLCLOSE \
     SI_FREEBSD || SI_LINUX_NOT_ANDROID || SI_MAC
+#endif
+
 #define SANITIZER_INTERCEPT_GETPASS SI_LINUX_NOT_ANDROID || SI_MAC
 #define SANITIZER_INTERCEPT_TIMERFD SI_LINUX_NOT_ANDROID