This patch removes use of -fno-builtin flag for building LLDB API
tests.
LLDB API tests are built using Makefile.rules where we were using
-fno-builtin flag to avoid gcc intrinsic optimization conflicting
with Android runtime in past.
Now that we no longer use gcc for building testsuite and compiling
LLDB API tests on AArch64/Windows require clang to optimize certain
calls like _setjmp to setjmpex as former is not implemented by
AArch64 windows runtime.
e4ed7ca996