[babl] babl: set ecx to 0 in cpuid

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 362f6e73cacb5ebdc34243e6719548c8fba8bef3
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Jan 17 19:07:07 2022 +0100

    babl: set ecx to 0 in cpuid
    
    This is neccesary to be able to detect AVX2 reliably.

 babl/babl-cpuaccel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/babl/babl-cpuaccel.c b/babl/babl-cpuaccel.c
index ef26fa58b..6c1f1cc11 100644
--- a/babl/babl-cpuaccel.c
+++ b/babl/babl-cpuaccel.c
@@ -136,7 +136,7 @@ enum
              "=S" (ebx),           \
              "=c" (ecx),           \
              "=d" (edx)            \
-           : "0" (op))
+           : "0" (op), "2" (0))
 #else
 #define cpuid(op,eax,ebx,ecx,edx)  \
   __asm__ ("xor %%ecx, %%ecx\n\t"  \
@@ -145,7 +145,7 @@ enum
              "=b" (ebx),           \
              "=c" (ecx),           \
              "=d" (edx)            \
-           : "0" (op))
+           : "0" (op), "2" (0))
 #endif