0.21.2
rename src/make_dafsa.py to src/psl-make-dafsa, add documentation
Makefile.am: use PYTHON when invoking psl-make-dafsa
Add NMake Makefiles for Visual Studio builds
Remove definition of _GCC_VERSION_AT_LEAST
meson: automatically add PSL_STATIC define when building Windows static library
Fix comments from C++ to C/C++ in psl-make-dafsa
Replace psl2c by psl-make-dafsa
Release v0.21.2