[PATCH] mldev: fix build for aarch32

[David Marchand <david.marchand@redhat.com>]

Caught by UNH lab, cross compiling for aarch32:

../lib/mldev/mldev_utils_neon.c: In function
	'__float32_to_int8_neon_s8x8':
../lib/mldev/mldev_utils_neon.c:34:10: error: implicit declaration
	of function 'vcvtaq_s32_f32'; did you mean 'vcvtq_s32_f32'?
	[-Werror=implicit-function-declaration]
   34 |  s32x4 = vcvtaq_s32_f32(f32x4);
      |          ^~~~~~~~~~~~~~
      |          vcvtq_s32_f32
../lib/mldev/mldev_utils_neon.c:34:10: error: nested extern declaration
	of 'vcvtaq_s32_f32' [-Werror=nested-externs]
../lib/mldev/mldev_utils_neon.c:34:10: error: incompatible types when
	assigning to type 'int32x4_t' from type 'int'
../lib/mldev/mldev_utils_neon.c:42:10: error: incompatible types when
	assigning to type 'int32x4_t' from type 'int'
   42 |  s32x4 = vcvtaq_s32_f32(f32x4);
      |          ^~~~~~~~~~~~~~

Only compile NEON optimisation for aarch64.

Fixes: fc54766b1612 ("mldev: add Arm NEON type conversion")

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 lib/mldev/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mldev/meson.build b/lib/mldev/meson.build
index 05694b0839..23d108617d 100644
--- a/lib/mldev/meson.build
+++ b/lib/mldev/meson.build
@@ -8,7 +8,7 @@ sources = files(
         'mldev_utils_scalar.c',
 )
 
-if arch_subdir == 'arm'
+if dpdk_conf.has('RTE_ARCH_ARM64')
     sources += files('mldev_utils_neon.c')
 endif
 
-- 
2.39.2