0.21.3
rename src/make_dafsa.py to src/psl-make-dafsa, add documentation
Install psl-make-dafsa script
Add NMake Makefiles for Visual Studio builds
Remove definition of _GCC_VERSION_AT_LEAST
meson: add support for symbol visibility
Fix comments from C++ to C/C++ in psl-make-dafsa
Replace psl2c by psl-make-dafsa
Fix ICONV_CONST compiler warning on Solaris