clang/test/CXX/conv/conv.fctptr/p1.cpp: Appease for targeting i686-win32.

  error: 'error' diagnostics seen but not expected:
    File clang\test\CXX\conv\conv.fctptr\p1.cpp Line 16: assigning to 'void (S::*)() __attribute__((thiscall)) noexcept' from incompatible type 'void (S::*)() __attribute__((thiscall))': different exception specifications

llvm-svn: 284352