build: Switch travis to AvrGcc

.github/travis/cmake-build.sh

@@ -4,7 +4,7 @@ rm -rf build
 mkdir build
 cd build
 cmake .. \
-    -DCMAKE_TOOLCHAIN_FILE="../cmake/LocalAvrGcc.cmake" \
+    -DCMAKE_TOOLCHAIN_FILE="../cmake/AvrGcc.cmake" \
     -DCMAKE_BUILD_TYPE=Release \
     -G Ninja
 ninja ALL_FIRMWARE