Default gcc toolchain config now use 'gcc' for linking. Was left accidentally to g++ since old times of wxSVG based SVGUI. Cleaned up gcc parameters when linking
<xsd:element name="Xenomai">
<xsd:complexType>
%(toolchain_gcc)s
<xsd:attribute name="XenoConfig" type="xsd:string" use="optional" default="xeno-config"/>
</xsd:complexType>
</xsd:element>