Generate source files before doing builds on Travis

On Linux, all.sh takes care of it. On Windows, run
make_generated_files.bat.

Perl is now required on Windows.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

.travis.yml

@@ -21,7 +21,7 @@ jobs:
       script:
         - tests/scripts/all.sh -k 'check_*'
         - tests/scripts/all.sh -k test_default_out_of_box
-        - tests/scripts/test-ref-configs.pl
+        - tests/scripts/all.sh -k test_ref_configs
         - tests/scripts/all.sh -k build_arm_none_eabi_gcc_arm5vte build_arm_none_eabi_gcc_m0plus
 
     - name: full configuration
@@ -39,11 +39,12 @@ jobs:
       before_install:
         - choco install python --version=3.5.4
       env:
-        # Add the directory where the Choco package goes
+        # Add the directory where the Choco packages go
         - PATH=/c/Python35:/c/Python35/Scripts:$PATH
       script:
+        - type perl; perl --version
         - type python; python --version
-        - python scripts/generate_psa_constants.py
+        - scripts/make_generated_files.bat
         # Logs appear out of sequence on Windows. Give time to catch up.
         - sleep 5
         - scripts/windows_msbuild.bat v141 # Visual Studio 2017