[babl] build: enable -ftree-vectorize always, and -mfpu=neon on aarch64

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

commit e237d2d473e94a83bc4f5f25680a8f08245f35e0
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Jan 22 00:06:37 2022 +0100

    build: enable -ftree-vectorize always, and -mfpu=neon on aarch64

 meson.build | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index a69250bcd..8c6eebf56 100644
--- a/meson.build
+++ b/meson.build
@@ -93,8 +93,12 @@ elif host_cpu_family == 'ppc64'
   have_ppc = true
   conf.set10('ARCH_PPC',    true)
   conf.set10('ARCH_PPC64',  true)
+elif host_cpu_family == 'arm'
+  have_arm = true
+  config.set10('ARCH_ARM',  true)
 endif
 
+
 host_os = host_machine.system()
 message('Host os: ' + host_os)
 
@@ -159,7 +163,7 @@ if buildtype == 'debugoptimized' or buildtype == 'release'
   common_c_flags += cc.get_supported_arguments(['-Ofast'])
 endif
 common_c_flags += cc.get_supported_arguments(
-  ['-fno-unsafe-math-optimizations']
+  ['-fno-unsafe-math-optimizations','-ftree-vectorize']
 )
 
 extra_warnings_list = [
@@ -181,6 +185,12 @@ else
   no_undefined = []
 endif
 
+if host_cpu_family == 'arm'
+  arm_neon_flags = cc.get_supported_arguments(['-mfpu=neon'])
+elif host_cpu_family == 'aarch64'
+  common_cflags += cc.get_supported_arguments(['-mfpu=neon'])
+endif
+
 
 ################################################################################
 # Check for compiler CPU extensions