[babl] babl: add sse2 flags when building RGB converter

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

commit fe65b2f9b7e2df228413f7e4bf914206068e0452
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Jan 23 23:16:59 2022 +0100

    babl: add sse2 flags when building RGB converter

 babl/base/meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/babl/base/meson.build b/babl/base/meson.build
index 886e1ae..aae1ddf 100644
--- a/babl/base/meson.build
+++ b/babl/base/meson.build
@@ -22,8 +22,8 @@ babl_base = static_library('babl_base',
   babl_base_sources,
   include_directories: [rootInclude, bablInclude],
   dependencies: [math, lcms],
-   c_args: common_c_flags
-)
+   c_args: common_c_flags + '-msse2'
+) 
 
 if host_cpu_family == 'x86_64'