https://git.ruby-lang.org/ruby.git/commit/?id=d44671c819

From d44671c819e104d329e604fdf9bb59bbb426afb5 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 28 Nov 2020 18:39:57 +0900
Subject: Revived the getenv macro for dln_find.c

This partially reverts commit "Windows: Improve readablity of
getenv() encoding" 14453a256d58b11b06d432e2a4388d95aac298d6.

The `getenv` macro defined here is to also substitute the function
in dln_find.c, not only in this file.

diff --git a/win32/win32.c b/win32/win32.c
index ac83195..5904082 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -77,6 +77,7 @@ static char *w32_getenv(const char *name, UINT cp); https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L77
 #define DLN_FIND_EXTRA_ARG_DECL ,UINT cp
 #define DLN_FIND_EXTRA_ARG ,cp
 #define rb_w32_stati128(path, st) w32_stati128(path, st, cp, FALSE)
+#define getenv(name) w32_getenv(name, cp) /* Necessarily For dln.c */
 #undef CharNext
 #define CharNext(p) CharNextExA(cp, (p), 0)
 #define dln_find_exe_r rb_w32_udln_find_exe_r
-- 
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