Fix test_env and test_environ to expect any locale. (#24632)

Fixes test to pass on different locales on Windows.

Author: juj

test/core/test_env.out

@@ -4,7 +4,7 @@ LOGNAME=web_user
 PATH=/
 PWD=/
 HOME=/home/web_user
-LANG=(C|en_US).UTF-8
+LANG=(C|.._..).UTF-8
 _=.*(/test_env.m?js|./this.program)
 
 getenv\(PATH\): /

test/core/test_environ.out

@@ -3,5 +3,5 @@ LOGNAME=web_user
 PATH=/
 PWD=/
 HOME=/home/web_user
-LANG=(C|en_US).UTF-8
+LANG=(C|.._..).UTF-8
 _=.*(/test_environ.m?js|/this.program)