Update .travis.yml

Author: martin-frbg

.travis.yml

@@ -301,7 +301,7 @@ matrix:
             - gcc-8
             - gfortran-8
       script:
-        - travis_wait 45 make CC=gcc-8 FC=gfortran-8 DYNAMIC_ARCH=1 
+        - travis_wait 45 make QUIET_MAKE=1 CC=gcc-8 FC=gfortran-8 DYNAMIC_ARCH=1 
       env:
         - TARGET_BOX=NEOVERSE_N1-GCC8