Revert "Detect setlocale(LC_CTYPE, NULL) clobbering previous return values."

This reverts commit b76e76be46.  The
buildfarm yielded no related failures.

src/backend/utils/adt/pg_locale.c

@@ -58,7 +58,6 @@
 #include "catalog/pg_collation.h"
 #include "catalog/pg_control.h"
 #include "mb/pg_wchar.h"
-#include "utils/builtins.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
 #include "utils/pg_locale.h"
@@ -149,7 +148,6 @@ pg_perm_setlocale(int category, const char *locale)
 	char	   *result;
 	const char *envvar;
 	char	   *envbuf;
-	char		orig_result[LC_ENV_BUFSIZE];
 
 #ifndef WIN32
 	result = setlocale(category, locale);
@@ -175,7 +173,6 @@ pg_perm_setlocale(int category, const char *locale)
 
 	if (result == NULL)
 		return result;			/* fall out immediately on failure */
-	strlcpy(orig_result, result, sizeof(orig_result));
 
 	/*
 	 * Use the right encoding in translated messages.  Under ENABLE_NLS, let
@@ -234,17 +231,6 @@ pg_perm_setlocale(int category, const char *locale)
 	}
 
 	snprintf(envbuf, LC_ENV_BUFSIZE - 1, "%s=%s", envvar, result);
-	if (strcmp(orig_result, result) != 0)
-	{
-		char		hex[2 * LC_ENV_BUFSIZE + 1];
-		unsigned	hexlen;
-
-		hexlen =
-			hex_encode(result, Min(1 + strlen(result), LC_ENV_BUFSIZE), hex);
-		hex[hexlen] = '\0';
-		elog(FATAL, "setlocale() result %s clobbered to 0x%s",
-			 orig_result, hex);
-	}
 
 	if (putenv(envbuf))
 		return NULL;