- Disable rosyln on ppc64le

- Update to version 5.0.0.100 (5.0 Stable)
- New features and changes:
* Shipping Roslyn C# compiler to enable C#7 support
* Support for msbuild and deprecating xbuild
(msbuild currently not included, xbuild deprecated but still maintained)
* Enabling concurrent SGen garbage collector to reduce time spent in GC
* Continued Progress on .NET Class Library convergence
- Packaging changes:
* Do not package roslyn csc compiler on platforms that do not support it
* Add xbuild-revert-to-mcs.patch: revert xbuild to use old mcs compiler on platforms that do not support roslyn

- Enable external BTLS library build only on supported platforms (x86 and x86_64 right now):
* Fix build for arm, arm64, ppc64, ppc64le.
- Enable pedump binary packaging for arm64 builds.

- Update to version 4.8.1.0 (4.8 Service Release 1)
- Remove patch mono-config-fix-monoposixhelper-libdir.patch:
* Instead, use fix from official spec file
- New features (see http://www.mono-project.com/docs/about-mono/releases/4.8.0 for more info):
* Some API additions for .NET Standard 2.0
* Mono now ships with TLS 1.2, powered by Google’s BoringSSL project
* The MKBundle tool has been updated to easily support cross-compilation
* Runtime Logging: the new MONO_LOG_DEST environment variable can set to instruct the runtime where to write the tracing messages to
* Concurrent SGen mode improved
* More code have been adopted from Reference Source
- Bugfixes:
* bxc#3323: Assertion when deleting global namespace inside method
* bxc#3399: [PATCH] pending_exception support is incomplete