Rationalise ./configure
- borrow a lot of ideas from Michael ABBOTT ( http://sourceware.org/ml/crossgcc/2008-12/msg00030.html )
- should be conforming to POSIX 1003.1-2008, non compliance due to bashsims is to be considered a bug
- as a result, it now works with dash
- make a little easier to read in some places
- enforce 4-space indentation
- get rid of futile 'return $?'
- quote all variables assignments
- save and restore IFS prior to and after using alternate values
- simplify the TOOLS_TO_CHECK listing

What's left:
- provide a mean to actually _compare_ version numbers
- change the TOOLS_TO_CHECK pattern style to be able to use '|' in regexp

/trunk/configure | 243 127 116 0 ++++++++++++++++++++++++++++++++------------------------------
1 file changed, 127 insertions(+), 116 deletions(-)

# ltrace

config DEBUG_ltrace

    select TOOL_libelf

    help

      ltrace is a program that simply runs the specified command until it exits.

      It intercepts and records the dynamic library calls which are called by

      the executed process and the signals which are received by that process.

      It can also intercept and print the system calls executed by the program.

choice

    bool

    prompt "ltrace version"

config LTRACE_V_0_4

    bool

    prompt "0.4"

config LTRACE_V_0_5

    bool

    prompt "0.5"

# CT_INSERT_VERSION_ABOVE

# Don't remove above line!

endchoice

config LTRACE_VERSION

    string

    default "0.4" if LTRACE_V_0_4

    default "0.5" if LTRACE_V_0_5

# CT_INSERT_VERSION_STRING_ABOVE

# # Don't remove above line!