Revert "compiler-rt: use __GLIBC_PREREQ for SANITIZER_INTERCEPT_GETRANDOM"
Revert "compiler-rt: move all __GLIBC_PREREQ into own header file"
"move all __GLIBC_PREREQ" breaks build on some bots
This reverts commit 2d75ee93.
This reverts commit 7a6461fc.
llvm-svn: 373367