add PKGBUILD file

OBS-URL: https://build.opensuse.org/package/show/openSUSE:Tools/build?expand=0&rev=177

build.spec

@@ -64,7 +64,6 @@ chroot environment.
 
 %package mkbaselibs
 Summary:        Tools to generate base lib packages
-Group:          Development/Tools/Building
 # NOTE: this package must not have dependencies which may break boot strapping (eg. perl modules)
 
 %description mkbaselibs
@@ -73,7 +72,6 @@ for generating base lib packages.
 
 %package mkdrpms
 Summary:        Tools to generate delta rpms
-Group:          Development/Tools/Building
 Requires:       deltarpm
 # XXX: we wanted to avoid that but mkdrpms needs Build::Rpm::rpmq
 Requires:       build