Change the operating system name from OSX to MacOS everywhere

Summary:
- Changed the name in all build artifacts
- Everywhere in C++

Reviewers: #swift_pilot_client, kbasan

Reviewed By: #swift_pilot_client, kbasan

Subscribers: jenkins

Maniphest Tasks: T205

Differential Revision: https://dev.swift-project.org/D69

src/blackmisc/db/distribution.cpp

@@ -59,9 +59,14 @@ namespace BlackMisc
                 {
                     if (!p.contains("linux", Qt::CaseInsensitive)) continue;
                 }
-                else if (CBuildConfig::isRunningOnMacOSXPlatform())
+                else if (CBuildConfig::isRunningOnMacOSPlatform())
                 {
-                    if (!(p.contains("mac", Qt::CaseInsensitive) || p.contains("osx", Qt::CaseInsensitive))) continue;
+                    if (!(p.contains("mac", Qt::CaseInsensitive) ||
+                          p.contains("macos", Qt::CaseInsensitive) ||
+                          p.contains("osx", Qt::CaseInsensitive)))
+                    {
+                        continue;
+                    }
                 }
                 reduced << p;
             }