Preventing ppc64le files from being generated for Android.

Change-Id: Iedf30f2711649e55fccfb77031c8617fca055ce7
Reviewed-on: https://boringssl-review.googlesource.com/11503
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/util/generate_build_files.py b/util/generate_build_files.py
index 678e745..0b84bfd 100644
--- a/util/generate_build_files.py
+++ b/util/generate_build_files.py
@@ -99,7 +99,7 @@
       blueprint.write('    target: {\n')
 
       for ((osname, arch), asm_files) in asm_outputs:
-        if osname != 'linux':
+        if osname != 'linux' or arch == 'ppc64le':
           continue
         if arch == 'aarch64':
           arch = 'arm64'