v8.6.3

Omnibus merge of submitted pull requests.

What's Changed

• configure: regenerate by @chrstphrchvz in #24
• Migrate CONST usage to const by @chrstphrchvz in #25
• Enable -Wsentinel warnings for TclX_AppendObjResult() by @chrstphrchvz in #23
• Fix TclX_AppendObjResult() calls with missing or uncast NULL terminators by @chrstphrchvz in #21
• tclXunixOS.c: remove floor()/ceil() declarations by @chrstphrchvz in #19
• Remove TCL_VARARGS_DEF/TCL_VARARGS_START usage by @chrstphrchvz in #22
• Use prototypes in function declarations/definitions by @chrstphrchvz in #20
• Add const to match tclExtdInt.h TclXOSInetAtoN def by @bandoti in #26

New Contributors

• @chrstphrchvz made their first contribution in #24
• @bandoti made their first contribution in #26

Full Changelog: v8.6.2...v8.6.3