Added wrapper tool

[jjr840430]

Added simple utility to convert a shell script retrace to executable binary.(issue #331 )

[jjr840430]

@drystone Here is the simple wrapper utility for retrace. Do you think this implementation may be used for making an executable binary for retrace?

[jjr840430]

@drystone It's just simple utility to show the ability to build retrace as executable binary. So I didn't care the details of full implementation. If it's enough to build execution binary of retrace, then I will remove it from tools and build new binary in src directory.

Do you think that it's the right way to implement executable binary of retrace?

[erikbor]

@jjr840430 great, can you implement the following please:

1. Check if getuid() != 0 && stat() the target executable for setuid bit because if it is setuid then we can't LD_PRELOAD/DYLD
2. Check if the target executable is ELF or MACH
3. Replace prog_name with extern char *__progname; so usage() won't need an argument

[ronaldtse]

@jjr840430 if you have time please feel free to complete this. Thanks!

[jjr840430]

@ronaldtse seems ready to be merged.

[ronaldtse]

@erikbor ready to merge this?

[erikbor]

@jjr840430 can you please fix the following in retrace.c:

"\t--lib <library path>     The path of libretrace.so library\n"

The .so message is now hardcoded but you did implement a #ifndef __APPLE__, so maybe it would be nice to reflect that back in the message. Thanks.

[erikbor]

@jjr840430 I'm fine with merging! Looks good. Thanks a lot.

[jjr840430]

@erikbor Thanks! :)

[jjr840430]

@erikbor Fixed

[ronaldtse]

Thanks @jjr840430 @erikbor !