Move Travis CI scripts to build-scripts folder

Fixes #26903

.travis.yml

@@ -17,10 +17,10 @@ before_install:
   - if php -r "exit( (int)! version_compare( '$TRAVIS_PHP_VERSION', '7.0', '>=' ) );"; then mkdir -p ~/bin && wget -O ~/bin/phpunit https://phar.phpunit.de/phpunit-5.7.phar && chmod +x ~/bin/phpunit; fi
 
 before_script:
-  - ./scripts/travis_before_script.sh
+  - ./build-scripts/travis_before_script.sh
 
 script:
-  - ./scripts/travis_script.sh
+  - ./build-scripts/travis_script.sh
 
 # -----------------------------------------------------------------------------
 # What to build, and on which platforms

scripts/README.md

@@ -1,18 +1,5 @@
 MantisBT scripts
 ================
 
-This directory contains some command-line scripts useful for performance
-or integration issues. Please refer to the mantis manual for a more complete
-documentation about their purpose and usage.
-
-## Included scripts
-
-### Operations
-
 - _send_emails.php_ :
     Allows sending bug mails asynchronously
-
-### Development
-
-- _travis_before_script.sh_ and _travis_script.sh_ :
-    Travis-CI scripts (used in _.travis.yml_)