third_party/waf: Explicit standard GNU directory command line options are not honoured

ref: https://gitlab.com/ita1024/waf/-/issues/2470

(cherry picked from commit aeec9358394f883f63b3ad78c2857117ca2cdfb4)

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Anoop C S <anoopcs@samba.org>

Autobuild-User(master): Anoop C S <anoopcs@samba.org>
Autobuild-Date(master): Fri Jun  6 10:53:07 UTC 2025 on atb-devel-224

Author: Waf Project

third_party/waf/waflib/Tools/gnu_dirs.py

@@ -75,7 +75,7 @@ def configure(conf):
 	BINDIR and LIBDIR will be overwritten.
 	"""
 	def get_param(varname, default):
-		return getattr(Options.options, varname, '') or default
+		return getattr(Options.options, varname.lower(), '') or default
 
 	env = conf.env
 	env.LIBDIR = env.BINDIR = []