powerpc: Fix powerpc meson build and little endian support

5 jobs for fix_ppc64le in 2 minutes and 7 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #504590
debian sid

00:01:17

passed #504593
docker windows 1607
msys2

00:00:51

passed #504591
docker windows 1607
vs2017 amd64

00:00:57

passed #504594
docker windows 1607
vs2017 x86

00:00:52

failed #504592
docker windows 1607
vs2017 x86

00:00:00