[buildbot][COMMITTED] Fix the build on the ppc BuildSlave

[Tulio Magno Quites Machado Filho]

The ppc BuildSlave runs on a ppc64 with ppc userspace, which requires
extra configure flags.
---
 scripts/slave/buildbot_selector.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/slave/buildbot_selector.py b/scripts/slave/buildbot_selector.py
index f05ad77..6c2394b 100755
--- a/scripts/slave/buildbot_selector.py
+++ b/scripts/slave/buildbot_selector.py
@@ -21,7 +21,11 @@ BOT_ASSIGNMENT = {
         '--with-cpu=power8',
         '--enable-lock-elision',
     ]),
-    'glibc-ppc-linux': bash('glibc-native.sh'),
+    'glibc-ppc-linux': bash('glibc-native.sh', [
+        '--build=powerpc-linux',
+        'CC=gcc -m32',
+        'CXX=g++ -m32',
+    ]),
     'glibc-ppc64le-linux': bash('glibc-native.sh'),
     'glibc-s390x-linux': bash('glibc-native.sh'),
     'glibc-aarch64-linux': bash('glibc-native.sh', [
-- 
2.9.5