HostOsInfo: Add some more useful abstractions.

Namely:
- path list separator
- executable suffix
- file name case sensitivity

All of these are duplicated in various places in the current Creator
code.

Change-Id: I86eb4662fa3c2071759bd728cae1aaf7111ae686
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

src/libs/utils/synchronousprocess.cpp

@@ -665,7 +665,7 @@ QString SynchronousProcess::locateBinary(const QString &path, const QString &bin
             return currentDirBinary;
     }
 
-    const QStringList paths = path.split(pathSeparator());
+    const QStringList paths = path.split(HostOsInfo::pathListSeparator());
     if (paths.empty())
         return QString();
     const QStringList::const_iterator cend = paths.constEnd();
@@ -684,9 +684,4 @@ QString SynchronousProcess::locateBinary(const QString &binary)
     return locateBinary(QString::fromLocal8Bit(path), binary);
 }
 
-QChar SynchronousProcess::pathSeparator()
-{
-    return HostOsInfo::isWindowsHost() ? QLatin1Char(';') : QLatin1Char(':');
-}
-
 } // namespace Utils