FTBFS on powerpcspe architecture

Hello,

On debian powerpcspe architecture, virglrenderer FTBFS with the following error:

libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../../.. -Wdate-time -D_FORTIFY_SOURCE=2 -I../../../src/gallium/auxiliary/util -I../../../src/gallium/auxiliary/ -I../../../include -I../../../src/gallium/include -I../../../src/gallium/auxiliary -pthread -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -specs=/usr/share/dpkg/pie-compile.specs -fstack-protector-strong -Wformat -Werror=format-security -c util/u_cpu_detect.c  -fPIC -DPIC -o util/.libs/u_cpu_detect.o
/tmp/cc3NmYFY.s: Assembler messages:
/tmp/cc3NmYFY.s:84: Error: unrecognized opcode: `vand'
make[4]: *** [Makefile:604: util/u_cpu_detect.lo] Error 1

FTR, there was a similar issue in mesa at some point: https://lists.freedesktop.org/archives/mesa-dev/2014-March/055158.html

https://wiki.debian.org/PowerPCSPEPort