Read image load config directly from memory

[woodruffw]

Right now we seek to and read from the right offset within the file HANDLE given to us by LOADED_IMAGE.hFile, but there's no need to do this when we already have the full file mapped into memory at LOADED_IMAGE.MappedAddress already.

winchecksec/Checksec.cpp

Line 80 in 6a88fd7

SetFilePointer(loadedImage.hFile, (LONG) loadConfigOffset, NULL, FILE_BEGIN);