swig/4.0.2: Replace get_exe_path by something that works on both Ubuntu and macOS

[jmarrec]

• Fixes [package] swig/4.0.2: SWIG_DIR (swiglib) is wrong on mac and points to the build machine #8674
• Specify library name and version: swig/4.0.2
• Replace get_exe_path by something that works on both Ubuntu and macOS so that swiglib is correctly defined on macOS as well

---

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[jmarrec]

Locally on mac I built it. Then I move it somewhere else, now the swiglib is correctly set (before it would still point to the original package dir)

cd conan-center-index/recipes/swig/all
conan create . swig/4.0.2@ -b missing

[...]
Configuration:
[settings]
arch=armv8
arch_build=armv8
build_type=Release
compiler=apple-clang
compiler.libcxx=libc++
compiler.version=13.0
os=Macos
os_build=Macos
[options]
[build_requires]
[env]
[...]


cd ~/Downloads && mkdir -p Temp && cd Temp
cp -R /Users/julien/.conan/data/swig/4.0.2/_/_/package/f230c9ff93e75f7f31a9ddd287cf970e1e2303b0/ .
./bin/swig -swiglib
=> /Users/julien/Downloads/temp/bin/swig/swiglib

[SSE4]

@jmarrec you have to link with dl, as you're clearly using dl functions (https://github.com/conan-io/conan-center-index/pull/8675/files#diff-2faad25d134ffa5e56b13352ef9e70f031c5603072e8b3780b457f196480f03fR14):

/home/conan/w/BuildSingleReference/.conan/data/swig/4.0.2/_/_/build/bd05f26165563c7f532e2f7411fda47374e19f99/Source/../source_subfolder/Source/Modules/main.cxx:889: undefined reference to `dladdr'
collect2: error: ld returned 1 exit status

[jmarrec]

@SSE4 You commented pretty much at the same time as I pushed a commit to link to DL. I used the LIBS env variable that is read by swig's configure script, I hope that's ok.

[jmarrec]

Need libdl

[conan-center-bot]

All green in build 2 (52247b9f6c00b7475daef72388ceea9e55e97a1e):

• swig/4.0.1@:
  All packages built successfully! (All logs)

• swig/4.0.2@:
  All packages built successfully! (All logs)