Please add support to enable to build with frame-pointer turned on. The
compilers in unstable default to -fomit-framepointer, this turns on
-fno-omit-framepointer plus an architecture specific option.

To enable it, use

   DEB_BUILD_MAINT_OPTIONS="... qa=+framepointer"

The chosen area might not be ideal, it could also be added to the
optimize area, however it is a "negative" optimization.

Currently the default is not changed in Debian, so this patch doesn't
have any effect for unstable's build flags.