SDL-1.2: Enable alloca on mingw/cygwin builds:

SDL Commits
1 
From 953288902f6978ff9128ed83cec7c5a55d063ee9 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 17 Jan 2022 20:55:10 +0300
Subject: [PATCH] Enable alloca on mingw/cygwin builds:

This effectively reverts commit 2013951be47a92c321100afb72b3cee32d4560ef
---
 configure.ac | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/configure.ac b/configure.ac
index 29c98001..b187e516 100644
--- a/configure.ac
+++ b/configure.ac
@@ -161,13 +161,7 @@ dnl Check for typedefs, structures, etc.
         have_inttypes=yes
     fi
 
-    case "$host" in
-    *-*-cygwin* | *-*-mingw*)
-        ;;
-    *)
-        AC_FUNC_ALLOCA
-        ;;
-    esac
+    AC_FUNC_ALLOCA
 
 dnl Checks for library functions.
     AC_FUNC_MEMCMP