fixed more -Wall -Werror errors

SConstruct

libIRDB/include/utils.hpp

libIRDB/src/core/SConscript

libIRDB/src/core/file.cpp

libIRDB/src/core/instruction.cpp

libIRDB/test/read_ehframe.cpp

libStructDiv/src/filebased.cpp

tools/spasm/spasm.cpp

tools/transforms/PNTransformDriver.cpp

xform/rewriter.cpp