Remove TravisCI mentions from build scripts

Travis CI is not used anymore, remove its mentions from the build scripts.

.github/workflows/ci.yml

@@ -8,7 +8,6 @@ on:
     paths-ignore:
       - '.github/workflows/ci_msw_cross.yml'
       - 'build/tools/appveyor*.bat'
-      - 'build/tools/travis-ci.sh'
       - 'distrib/**'
       - 'docs/**'
       - 'interface/**'
@@ -25,7 +24,6 @@ on:
     paths-ignore:
       - '.github/workflows/ci_msw_cross.yml'
       - 'build/tools/appveyor*.bat'
-      - 'build/tools/travis-ci.sh'
       - 'distrib/**'
       - 'docs/**'
       - 'interface/**'

.github/workflows/ci_msw_cross.yml

@@ -8,7 +8,6 @@ on:
     paths-ignore:
       - '.github/workflows/ci.yml'
       - 'build/tools/appveyor*.bat'
-      - 'build/tools/travis-ci.sh'
       - 'distrib/**'
       - 'docs/**'
       - 'interface/**'
@@ -27,7 +26,6 @@ on:
     paths-ignore:
       - '.github/workflows/ci.yml'
       - 'build/tools/appveyor*.bat'
-      - 'build/tools/travis-ci.sh'
       - 'distrib/**'
       - 'docs/**'
       - 'interface/**'

appveyor.yml

@@ -28,8 +28,6 @@ skip_commits:
     - src/x11/
     - '**/*.md'
     - .github/workflows/
-    - .travis.yml
-    - build/tools/travis-ci.sh
     - build/tools/before_install.sh
     - build/tools/httpbin.sh
 

build/tools/before_install.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# This script is used by both GitHub and Travis CI to install the dependencies
+# This script is used by GitHub to install the dependencies
 # before building wxWidgets but can also be run by hand if necessary (but
 # currently it only works for Ubuntu versions used by the CI builds).