Moved LPC specific code from toolchain_makefile into LPC target, added FROM_BEREMIZ variable to tell LPC's makefile it is invoked from here.
<xsd:element name="Win32">
<xsd:complexType>
<xsd:attribute name="Compiler" type="xsd:string" use="optional" default="mingw32-gcc-sjlj"/>
<xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>
<xsd:attribute name="Linker" type="xsd:string" use="optional" default="mingw32-g++-sjlj"/>
<xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>
</xsd:complexType>
</xsd:element>