scripts: refine static linking check to better guide the user

The current mechanism to check if static linking is possible, and the mesage
displayed on failure, can be puzzling to the unsuspecting user.

Also, the current implementation is not using the existing infrastructure,
and is thus difficult to enhance with new tests.

So, switch to using the standard CT_DoExecLog infra, and use four tests to
check for the host compiler:
- check we can run it
- check it can build a trivial program
- check it can statically link that program
- check if it statically link with libstdc++

That should cover most of the problems. Hopefully.

(At the same time, fix a typo in a comment)

Signed-off-by: Daniel Price <daniel.price@gmail.com>
[yann.morin.1998@free.fr: split original patch for self-contained changes]
[yann.morin.1998@free.fr: use steps to better see gcc's output]
[yann.morin.1998@free.fr: commit log]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <163f86b5216fc08c672a.1353459722@nipigon.dssd.com>
Patchwork-Id: 200536

 Correctly check for g++ existence.

 Copyright 2007 Yann E. MORIN <yann.morin.1998@anciens.enib.fr>

 Licensed to you as dmalloc-5.5.2 is.

 diff -dur dmalloc-5.5.2.orig/configure dmalloc-5.5.2/configure

 --- dmalloc-5.5.2.orig/configure	2007-05-18 11:40:31.000000000 +0200

 +++ dmalloc-5.5.2/configure	2007-05-18 11:42:02.000000000 +0200

 @@ -2643,7 +2643,7 @@

  # see if we actually have a CXX program

 -if test "$ac_cv_prog_CXX" = "" -o ! -x "$ac_cv_prog_CXX"; then

 +if test "$ac_cv_prog_CXX" = "" -o ! -x `which "$ac_cv_prog_CXX"`; then

      { echo "$as_me:$LINENO: WARNING: could not find C++ compiler $ac_cv_prog_CXX" >&5

  echo "$as_me: WARNING: could not find C++ compiler $ac_cv_prog_CXX" >&2;}

      enable_cxx=no