MFH: revert patch that causes invalid reads/crashes on Linux

NEWS

@@ -5,8 +5,6 @@ PHP                                                                        NEWS
   functions. (Andrey)
 - Fixed bug #44891 Memory leak using registerPHPFunctions and XSLT Variable 
   as function parameter. (Rob)
-- Fixed bug #44836 (putenv() crashes, avoid direct reference of environ in    
-  POSIX systems). (Ilia, delphij at FreeBSD dot org)
 - Fixed bug #44830 (Very minor issue with backslash in heredoc). (Matt)
 - Fixed bug #44811 (Improve error message when creating a new SoapClient that 
   contains invalid data). (Markus Fischer, David C)

ext/standard/basic_functions.c

@@ -3859,7 +3859,9 @@ static void php_putenv_destructor(putenv_entry *pe)
 		SetEnvironmentVariable(pe->key, "bugbug");
 #endif
 		putenv(pe->previous_value);
+# if defined(PHP_WIN32)
 		efree(pe->previous_value);
+# endif
 	} else {
 # if HAVE_UNSETENV
 		unsetenv(pe->key);
@@ -4459,8 +4461,12 @@ PHP_FUNCTION(putenv)
 		pe.previous_value = NULL;
 		for (env = environ; env != NULL && *env != NULL; env++) {
 			if (!strncmp(*env, pe.key, pe.key_len) && (*env)[pe.key_len] == '=') {	/* found it */
-				/* must copy previous value because putenv can free the string without notice */
+#if defined(PHP_WIN32)
+				/* must copy previous value because MSVCRT's putenv can free the string without notice */
 				pe.previous_value = estrdup(*env);
+#else
+				pe.previous_value = *env;
+#endif
 				break;
 			}
 		}