libmpcdec-1.2.6-bp160.1.12

- Use %autosetup macro. Allows to eliminate the usage of deprecated
  %patchN

- Minor spec-cleaner run

- Add baselibs.conf as source

- Update source url
- Explicitly depend on autoconf/automake
- Cleanup spec file with spec-clener

- libmpcdec-byteswap.patch, use OS byteswap routines.
  (that in turns needs AC_USE_SYSTEM_EXTENSIONS)
  - build with large file support.

- added 32bit compatibility libraries
- package no longer obsoletes itself (fix for RPMLINT warning)

- Add gcc-c++ as build requires to fix build.

- disable autoreconf to fix build

- fixes build on ia-64 only useless and unpackaged sample
  requires g++ for build (libmpcdec-1.2.6-nosamples.patch)

- remove static libraries
- remove libtool archive with empty dependency_libs
- add missing glibc-devel dependency on -devel package