package/liquid-dsp: fix build failure on powerpc64le

Commit 7d435d8510db69ed2f9108abaa52479bce127b72 fixed building on
powerpc and powerpc64. This extends that fix to cover powerpc64le,
which suffers from the same problem.

Fixes:
http://autobuild.buildroot.net/results/45c4651a833e4667d4ef68e619cf4b5749a288da

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/liquid-dsp/liquid-dsp.mk

@@ -35,7 +35,7 @@ LIQUID_DSP_LDFLAGS += -lfftw3f
 endif
 
 # disable altivec, it has build issues
-ifeq ($(BR2_powerpc)$(BR2_powerpc64),y)
+ifeq ($(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),y)
 LIQUID_DSP_CONF_OPTS += --enable-simdoverride
 endif