* contrib/ari/gdb_ari.sh (LANG, LC_ALL): Use 'C' instead of 'c'

	* contrib/ari/gdb_ari.sh (LANG, LC_ALL): Use 'C' instead of 'c'
	as default language.
	(AWK): Use = instead of == for sh test to avoid warning.
	(Linux rule): Correct [:digit] into [[:digit:]].
	(__func__ rule): Adapt to "gdb_assert.h" move to common subdirectory.
	(vasprintf rule): Adapt to common subdirectory moves.
	(xasprintf rule): Idem.
	(xvasprintf rule): Idem.
	(var_boolean rule): Accept occurence in == or != test.

	* contrib/ari/gdb_find.sh: Also prune gdbtk directory.