Drop udev dependency.

[packaging] Drop udev dependency. Contributes to JB#46697

Udev is needed for cdrom/media detection which we do not need.

Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

rpm/libzypp.spec

@@ -15,7 +15,6 @@ Patch6:         0006-libzypp-Enable-netrcoptional-on-libcurl-to-allow-for.patch
 Patch7:         0007-Set-GPG-homedir-when-reading-signatures.patch
 BuildRequires:  cmake
 BuildRequires:  openssl-devel
-BuildRequires:  libudev-devel
 # Need boost > 1.53 for string_ref utility
 BuildRequires:  boost-devel >= 1.53.0 
 BuildRequires:  doxygen
@@ -60,7 +59,6 @@ Requires:       bzip2
 Requires:       popt-devel
 Requires:       boost-devel >= 1.60.0
 Requires:       libstdc++-devel
-Requires:       libudev-devel
 Requires:       cmake
 Requires:       curl-devel
 Requires:       libsolv-devel