Utils: Make a FilePath's osType publicly accessible

Will help with proper is{Relative,Absolute}Path implementations.

Change-Id: Icad90b5a55d9cf733f6ee66dbbe273ec9682d387
Reviewed-by: David Schulz <david.schulz@qt.io>

src/libs/utils/fileutils.cpp

@@ -1011,15 +1011,8 @@ FilePath FilePath::symLinkTarget() const
 
 FilePath FilePath::withExecutableSuffix() const
 {
-    OsType osType;
-    if (needsDevice()) {
-        QTC_ASSERT(s_deviceHooks.osType, return {});
-        osType = s_deviceHooks.osType(*this);
-    } else {
-        osType = HostOsInfo::hostOs();
-    }
     FilePath res = *this;
-    res.setPath(OsSpecificAspects::withExecutableSuffix(osType, m_data));
+    res.setPath(OsSpecificAspects::withExecutableSuffix(osType(), m_data));
     return res;
 }
 
@@ -1427,6 +1420,15 @@ QFile::Permissions FilePath::permissions() const
     return toFileInfo().permissions();
 }
 
+OsType FilePath::osType() const
+{
+    if (needsDevice()) {
+        QTC_ASSERT(s_deviceHooks.osType, return {});
+        return s_deviceHooks.osType(*this);
+    }
+    return HostOsInfo::hostOs();
+}
+
 bool FilePath::removeFile() const
 {
     if (needsDevice()) {

src/libs/utils/fileutils.h

@@ -174,6 +174,7 @@ public:
     bool isNewerThan(const QDateTime &timeStamp) const;
     QDateTime lastModified() const;
     QFile::Permissions permissions() const;
+    OsType osType() const;
     bool removeFile() const;
     bool removeRecursively(QString *error = nullptr) const;
     bool copyFile(const FilePath &target) const;