Abi: Add endianness method

For now this uses the architecture to decide which endianness to use.
That does not work too well, so a endianness field is needed for
the master branch.

Change-Id: I394a959c4182271ee9847de7c8da1788a027c3a2
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/abi.cpp

@@ -739,6 +739,14 @@ QList<Abi> Abi::abisOfBinary(const Utils::FileName &path)
     return result;
 }
 
+ProjectExplorer::Abi::Endianness Abi::endianness() const
+{
+    if (m_architecture == X86Architecture)
+        return LittleEndian;
+    // All other architectures are bi-endian:/
+    return UnknownEndian; // Todo: Add a field for endianness to the Abi struct!
+}
+
 } // namespace ProjectExplorer
 
 // Unit tests: