package/jpeg: SIMD needs VSX with little endian

SIMD needs VSX with little endian to avoid the following build failure:

In file included from /nvmedata/autobuild/instance-12/output-1/build/jpeg-turbo-2.1.3/simd/powerpc/jccolor-altivec.c:25:
/nvmedata/autobuild/instance-12/output-1/build/jpeg-turbo-2.1.3/simd/powerpc/jccolext-altivec.c: In function 'jsimd_rgb_ycc_convert_altivec':
/nvmedata/autobuild/instance-12/output-1/build/jpeg-turbo-2.1.3/simd/powerpc/jsimd_altivec.h:93:26: warning: implicit declaration of function 'vec_vsx_ld'; did you mean 'vec_vsl'? [-Wimplicit-function-declaration]
   93 | #define VEC_LD(a, b)     vec_vsx_ld(a, b)
      |                          ^~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/be6d5ad0cee4ee19eb25e595d44555a1af6e073b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/jpeg/Config.in

@@ -3,7 +3,8 @@ config BR2_PACKAGE_JPEG_SIMD_SUPPORT
 	bool
 	default y if BR2_X86_CPU_HAS_MMX
 	default y if BR2_ARM_CPU_HAS_NEON
-	default y if BR2_POWERPC_CPU_HAS_ALTIVEC
+	default y if BR2_POWERPC_CPU_HAS_ALTIVEC && !BR2_powerpc64le
+	default y if BR2_POWERPC_CPU_HAS_VSX && BR2_powerpc64le
 	default y if BR2_aarch64 || BR2_aarch64_be
 
 config BR2_PACKAGE_JPEG