public boolean isWeak() {
		return (symbolClass & kPEFWeakImportSymMask) != 0;
	}
The imported symbol does not have to 
be present at fragment preparation time in 
order for execution to continue. 
@return if the symbol is weak
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/pef/ImportedSymbol.java