oprofile: Don't set HAVE_LIBBFD when not using the prebuilt toolchain

The oprofile Makefiles complain about not finding exported libbfd
includes when using a different toolchain.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
oprofile: Fix build in ISO C++11 mode

Fixes macro constructs that can be confused with the new
string literals

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>