Remove redundant make check from Travis build

make distcheck already runs make check in the new location, so any
failures should start showing up there.

[skip ci]

.travis_build.sh

@@ -15,10 +15,10 @@ cd build
 # Run the configuration script
 ../configure
 
-# Build and run any tests
+# Build the sourcecode
 make V=0
-make check
 
 # Verify that the distribution works
+# This also runs any tests
 make distcheck