Add ppc64le targets

Author: jprjr

.travis.yml

@@ -9,11 +9,13 @@ env:
   - GCCVER=7.3.0 TARGET=arm-linux-musleabi
   - GCCVER=7.3.0 TARGET=arm-linux-musleabihf
   - GCCVER=7.3.0 TARGET=aarch64-linux-musl
+  - GCCVER=7.3.0 TARGET=powerpc64le-linux-musl
   - GCCVER=6.4.0 TARGET=x86_64-linux-musl
   - GCCVER=6.4.0 TARGET=i486-linux-musl
   - GCCVER=6.4.0 TARGET=arm-linux-musleabi
   - GCCVER=6.4.0 TARGET=arm-linux-musleabihf
   - GCCVER=6.4.0 TARGET=aarch64-linux-musl
+  - GCCVER=6.4.0 TARGET=powerpc64le-linux-musl
 
 install:
   - mkdir -p tools/bin