scripts: wscript: nswitch: do the libstdc++ hack right before build to not pollute the environment

engine/wscript

@@ -58,12 +58,8 @@ def configure(conf):
 		if not conf.env.HAVE_SDL2:
 			conf.fatal('SDL2 not availiable! Install switch-sdl2!')
 		conf.define('XASH_SDL', 2)
-		# HACK: now link in the entirety of libstdc++ so that dynamic libs could use all of it without manual exporting
-		# we can't do this right away because std::filesystem will complain about not having pathconf(),
-		# which we have defined in sys_nswitch.c
 		conf.env.LDFLAGS.remove('-lstdc++')
 		conf.env.LDFLAGS.remove('-lm')
-		conf.env.LDFLAGS += ['-Wl,--whole-archive', '-lstdc++', '-Wl,--no-whole-archive', '-lm']
 	elif conf.options.FBDEV_SW:
 		# unused, XASH_LINUX without XASH_SDL gives fbdev & alsa support
 		# conf.define('XASH_FBDEV', 1)
@@ -195,6 +191,10 @@ def build(bld):
 
 	# Switch has custom parameters
 	if bld.env.DEST_OS == 'nswitch':
+		# HACK: link in the entirety of libstdc++ so that dynamic libs could use all of it without manual exporting
+		# we can't do this right away because std::filesystem will complain about not having pathconf(),
+		# which we have defined in sys_nswitch.c
+		bld.env.LDFLAGS += ['-Wl,--whole-archive', '-lstdc++', '-Wl,--no-whole-archive', '-lm']
 		bld(source = source,
 			target = 'xash',
 			features = 'c cxxprogram',