Fix scrolling in SWF.ListView.EnsureVisible(int index)

This fixes https://bugzilla.xamarin.com/show_bug.cgi?id=22483
[mdoc] New make test for the --dropns functionality
[mdoc] New make test, reproduces issue with --dropns when run with a secondary assembly that doesn't drop the specified namespace
[mdoc] added -dropns-assemblies parameter.
Will now only replace the namespace when the type or member is in a listed assembly
[mdoc] Formatting feedback from pull #1273
[mdoc] consolidated dropns and dropns-assemblies into a single parameter.

Based on pull request feedback, this is a simpler usage, and meets our required use-case. A sample version of this parameter would be: `--dropns MyUnifiedAssembly=MyDroppedPrefix`
[System] Add performanceCounters element to System.Diagnostics app.config configuration section

See http://msdn.microsoft.com/en-us/library/ms229387(v=vs.110).aspx for details about the element.
The value that is set by the element isn't currently used in Mono, but applications using it in their app.config crash otherwise (e.g. http://stackoverflow.com/questions/25741651).
[runtime] Fix the my_g_bit_nth_msf () function for win64.
[runtime] Disable VS warnings C4273 (inconsistent dll linkage), and C4005 (macro redefinition). The former occurs becase we mark exported function declarations using MONO_API, but not the definitions. The latter occurs because we define _WINSOCKAPI_.
[mcs] struct parameterless instance constructors
[runtime] Make stack walks done by the sampling profiler async safe.
[WCF]: Update to my last fix for bug #22129.

The problem already starts when creating the OperationDescription; we need
to also look at the End* method here to correctly parse the reply parameters.

Then ClientRuntimeChannel.Process needs to distinguish between sync/async
and copy the out/byref parameters when needed.
Fix mobile and mobile_static profiles

And bring them to parity with monodroid and monotouch
[jit] Make calls from gshared to gsharedvt sharable methods indirect since otherwise at runtime we might find an instantiation and we cannot patch the call, leading to performance problems. Fixes #23021.
[xbuild] Fix few crashes when task loading fails
[mkbundle] Fix check for dos2unix

This fixes the command to check for dos2unix and makes mkbundle usable again with mingw.
We need first to redirect the standard input, otherwise the check always fails with an InvalidOperationException and set CreateNoWindow=false to avoid spawning a new window.
[runtime] Use statfs(2) on Android.

Fixes: https://bugzilla.xamarin.com/show_bug.cgi?id=23077

Reverts commit 53ce92470.

Commit 53ce92470 disabled use of statfs(2) on Android, for unspecified
reasons. (My *suspicion* is that the Android version mono was
originally ported to didn't have statfs(2), but I can neither confirm
nor deny that guess.)

Android has supported statfs(2) since API-4 Android v1.6 (in that
statfs(2) is in the header files); what's missing is MNT_RDONLY. What
IS present is MS_RDONLY, which appears to serve the same purpose.

Re-enable use of statfs(2) and use MS_RDONLY when building against the
Android NDK.
Merge pull request #1288 from ylatuya/patch-2

[mkbundle] Fix check for dos2unix
[xbuild] Workaround for issues with CreateItem task where metadata are not generated due to up-to-data inputs. Fixes #23022
[sdb] Implement support for win64.