[PATCH] UBUNTU: [Packaging] fix a mistype

[Seth Forshee]

On Fri, Mar 01, 2019 at 04:43:45PM +0300, Ignat Loskutov wrote:
> HAVE_CPLUS_DEMANGLE_SUPPORT=1 used to be spelled incorrectly, leading to
> missing C++ demangling support in perf.

Thanks for the patch! We do require a Signed-off-by line for patches
though. Please reply with your sign off and we can add it to the patch
when applying. Thanks!

Seth