Fix conda example packaging

[ischoegl]

Changes proposed in this pull request

• Add SCons option package_build
• If selected (i.e. package_build=y), exclude 'include' and 'library' paths outside of build and host enviroments in development sample Makefile's and SConstruct's, as well as include/cantera/Cantera.mak and /lib/pkgconfig/cantera.pc
• Fix Fortran Makefiles

PR ensures that libcantera-devel packages all C++ and Fortran examples without referencing the build environment.

If applicable, fill in the issue number this pull request is fixing

Closes Cantera/conda-recipes#37

If applicable, provide an example illustrating new features this pull request is introducing

With an updated conda-recipes using the SCons flag package_build=y, the following will work

$ conda create -y -n ct-env make scons cmake
$ conda activate ct-env
$ conda install -y -c cantera libcantera-devel

C++ examples can be compiled with preconfigured build tools:

$ cd path/to/conda/envs/ct-env/shared/cantera/samples/cxx/demo
$ make
$ scons
$ cmake . && cmake --build .

Same for Fortran F90 (and F77):

$ cd path/to/conda/envs/ct-env/shared/cantera/samples/f90
$ make
$ scons
$ cmake . && cmake --build .

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[speth]

This makes sense to me, in general. I have just a few questions / suggestions related to a few of the implementation details.

[ischoegl]

@speth ... thanks for the review! I addressed all comments - overall, I believe this PR should fix most remaining issues for libcantera-devel built by conda-recipes. (once those pending PR's as well as the package_build option are added)

On a separate note, for the last action, all 18.04 ubuntu runners were cancelled.

[codecov]

Codecov Report

Merging #1366 (d710204) into main (b9148b0) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
- Coverage   70.93%   70.89%   -0.04%     
==========================================
  Files         356      357       +1     
  Lines       51471    51500      +29     
  Branches    17189    17198       +9     
==========================================
  Hits        36510    36510              
- Misses      12667    12696      +29     
  Partials     2294     2294              

Impacted Files	Coverage Δ
src/clib/ct.cpp	7.56% <0.00%> (-0.13%)	⬇️
include/cantera/base/ExternalLogger.h	0.00% <0.00%> (ø)

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[speth]

Looks good to me.