sdl12-compat: fix SSE2 builds after previous ARM NEON commit.

SDL Commits
1 
From 09a3cec4eb4a256d717a107c5390cfad5542ce26 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Sun, 10 Apr 2022 04:33:50 +0300
Subject: [PATCH] fix SSE2 builds after previous ARM NEON commit.

---
 src/dr_mp3.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/dr_mp3.h b/src/dr_mp3.h
index 52609bb..22348b0 100644
--- a/src/dr_mp3.h
+++ b/src/dr_mp3.h
@@ -2117,7 +2117,11 @@ static void drmp3d_synth(float *xl, drmp3d_sample_t *dstl, int nch, float *lins)
             vst1_lane_s16(dstl + (49 + i)*nch, pcmb, 2);
 #endif
 #else
+#if DRMP3_HAVE_SSE
+            static const drmp3_f4 g_scale = { 1.0f/32768.0f, 1.0f/32768.0f, 1.0f/32768.0f, 1.0f/32768.0f };
+#else /* NEON: */
             const drmp3_f4 g_scale = vdupq_n_f32(1.0f/32768.0f);
+#endif
             a = DRMP3_VMUL(a, g_scale);
             b = DRMP3_VMUL(b, g_scale);
 #if DRMP3_HAVE_SSE