Log Message:
xentools411: backport upstream commit to work around compilation issue
with GCC>=8 and _FORTIFY_SOURCE.

GCC refuses to inline functions with different target attributes.
SSP headers (upstream GCC and netbsd's) use always_inline.

If we reduce the target options ("no SSE") then it can't inline the
default options (yes SSE) ssp/string.h functions.

PR toolchain/54672