Fix Travis CI build.

ports/ci/appveyor/install_deps.bat

@@ -22,20 +22,7 @@ setlocal
 
 if "%CMAKE_GENERATOR%" == "MSYS Makefiles" set PATH=C:\msys64\usr\bin;%PATH%
 if "%CMAKE_GENERATOR%" == "MSYS Makefiles" (
-    pacman --noconfirm -Syyu ^
+    bash -lc "cd /c/projects/akvirtualcamera && ./ports/ci/appveyor/install_deps.sh"
-        --ignore filesystem,pacman,pacman-mirrors
-    pacman --noconfirm --needed -S ^
-        cmake ^
-        git ^
-        make ^
-        pkg-config ^
-        python3 ^
-        mingw-w64-x86_64-binutils ^
-        mingw-w64-i686-binutils ^
-        mingw-w64-x86_64-cmake ^
-        mingw-w64-i686-cmake ^
-        mingw-w64-x86_64-pkg-config ^
-        mingw-w64-i686-pkg-config
 )
 
 endlocal

ports/ci/appveyor/install_deps.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# akvirtualcamera, virtual camera for Mac and Windows.
+# Copyright (C) 2021  Gonzalo Exequiel Pedone
+#
+# akvirtualcamera is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# akvirtualcamera is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with akvirtualcamera. If not, see <http://www.gnu.org/licenses/>.
+#
+# Web-Site: http://webcamoid.github.io/
+
+yes | pacman --noconfirm -Syyu \
+    --ignore filesystem,pacman,pacman-mirrors
+yes | pacman --noconfirm --needed -S \
+    cmake \
+    git \
+    make \
+    pkg-config \
+    python3 \
+    mingw-w64-x86_64-binutils \
+    mingw-w64-i686-binutils \
+    mingw-w64-x86_64-cmake \
+    mingw-w64-i686-cmake \
+    mingw-w64-x86_64-pkg-config \
+    mingw-w64-i686-pkg-config