subfolder callback, module cheese
Fix __declspec(dllexport) function decorator for the functionn find_cheeses
Modified cheesefinder.h and cheesefinder.c
subfolder libraries, module call_mymath
Fix
1 same function decorator
  Modifled mymath.h and mymath.c
2 add #include directive for the file "mymath.c"
  change #include directove for the file "math.h" to angle brackets
  to ensure proper C standard file included
3 mofify file Setup.py
  add check not sys.platform.startswith("win") prior call to gcc compiler
  make call to cythonize conditional upon check for library file presence
  add second variant of cythonize for windows without libraries and
  library_dirs parameters
Modify Setup.py under Demos subfolder
1 add to  the list of exclusions callback and libraries
2 organize custom extensions into array
3 ensure include_dirs for the extensions point to correct folders
4 ensure sources are correctly provided

subfolder callback, module cheese
Fix __declspec(dllexport) function decorator for the functionn
find_cheeses
Modified cheesefinder.h and cheesefinder.c
subfolder libraries, module call_mymath
Fix
1 same function decorator
  Modifled mymath.h and mymath.c
2 add #include directive for the file "mymath.c"
  change #include directove for the file "math.h" to angle brackets
  to ensure proper C standard file included
3 mofify file Setup.py
  add check not sys.platform.startswith("win") prior call to gcc compiler
  make call to cythonize conditional upon check for library file
  presence
  add second variant of cythonize for windows without libraries and
  library_dirs parameters
Modify Setup.py under Demos subfolder
1 add to  the list of exclusions callback and libraries
2 organize custom extensions into array
3 ensure include_dirs for the extensions
4 ensure sources are correctly provided

- reduce the number of parameters in setup.py to just necessary
- remove superfluous call to get_include()
- remove specific directory to search for include files
- replace explicit module name(s) with *, as those match .pyx file name
- remove DLL_EXPORT directive from custom .c files in cheese and my_mathcall modules

for callback and libraries .h file replace custom define with Python standard exports.h define Py_EXPORTED_SYMBOL
for setup.py script under libraries module improve building library using distutil compile, create_static_lib ccompiler class methods for Microsoft Windows platform

Add python's include directory on command line to ensure correct build

Modify local setup.py under ./Demos/libraries to pick up its name from PYX file
Modify common setup.py under ./Demos so that no dependency on numpy to build callback
Retain common setup.py stopping on error immediatelly

…me/cython into miron/fix-demo-modules

Use variable for library name
Ensure plaform specific handling of include directories
Fix header line of setup.py under ./libraries
Apply python formatter to align code