Touch the checked out source to fix clock skew on all platform

.travis.yml

@@ -32,6 +32,8 @@ cache:
 
 env:
   global:
+    # Reset timestamps early, before updating Homebrew etc.
+    - _=$(touch NEWS && find . -type f -exec touch -r NEWS {} +)
     - CONFIGURE_TTY=no
     - CCACHE_COMPILERCHECK=none
     - CCACHE_NOCOMPRESS=1
@@ -362,8 +364,6 @@ env:
       - TEST_ALL_OPTS="-v --timeout-scale=2.0 --tty=no --excludes=\$(TESTSDIR)/excludes/_travis/osx"
       # Disabling -j3 because it seems to cause a hang on building Ruby: https://travis-ci.org/ruby/ruby/jobs/471021727
       - JOBS=
-      # Reset timestamps early, before updating Homebrew etc.
-      - _=$(touch NEWS && find . -type f -exec touch -r NEWS {} +)
 
   - &dependency
     name: Check dependencies in makefiles