beremiz

file isExecutable
fix issue that in Debug mode LD instance doesn't show correctly its state after
continuation of FBD_Connector.

Previously state signals doesn't propogate through FBD_Connector.
<xsd:attribute name="Compiler" type="xsd:string" use="optional" default="gcc"/>
<xsd:attribute name="CFLAGS" type="xsd:string" use="optional" default=""/>
<xsd:attribute name="Linker" type="xsd:string" use="optional" default="gcc"/>
<xsd:attribute name="LDFLAGS" type="xsd:string" use="optional" default=""/>