makedeb: Work in a temporary directory
makedeb: Work in a temporary directory

makedeb currently works in the %_builddir directory, and expects to be
able to clear it out completely when it is finished.   This makes it
difficult to prevent concurrent instances of makedeb from interfering
with each other.  For simplicity, change makedeb to build each package
in its own temporary directory.

Signed-off-by: Euan Harris <c3b6e83069c8e9e3af49a38fec6026be89559638@citrix.com>

euanh/planex-cleanhistory,euanh/planex-cleanhistory,euanh/planex-cleanhistory