libdw: Update DW_LANG codes

libdw: Update DW_LANG codes

Pick up the language codes published after DWARF5 was published.
The are listed at https://dwarfstd.org/languages.html

Also adjust C language dectection in dwarf_getfuncs and update the
dwarf_default_lower_bound function to return the default lower bounds
for the new langauge codes.

There is one small change in dwarf_default_lower_bound. We now return
zero instead of an error when called for DW_LANG_Mips_Assembler. Since
there is now an "official" DW_LANG_Assembly which is explicitly
defined as having a default lower bound of zero. It seems better to do
the same for the vendor code too.

    * libdw/dwarf.h: Add new DW_LANG codes.
    * libdw/dwarf_default_lower_bound.c (dwarf_default_lower_bound):
    Handle new language codes and remove a special case for
    DW_LANG_Mips_Assembler.
    * libdw/dwarf_getfuncs.c (dwarf_getfuncs): Check against
    DW_LANG_C17 and DW_LANG_C23.
    * tests/dwarf_default_lower_bound.c: Also check for
    DW_LANG_Mips_Assembler.

Signed-off-by: Mark Wielaard <mark@klomp.org>