Removed unnecessary code.

ports/ci/linux-mingw/build.sh

@@ -36,7 +36,7 @@ echo
 echo "Building x64 virtual camera driver"
 echo
 buildDir=build-${COMPILER}-x64
-mkdir ${buildDir}
+mkdir -p ${buildDir}
 x86_64-w64-mingw32-cmake \
     -LA \
     -S . \
@@ -52,7 +52,7 @@ echo
 echo "Building x86 virtual camera driver"
 echo
 buildDir=build-${COMPILER}-x86
-mkdir ${buildDir}
+mkdir -p ${buildDir}
 i686-w64-mingw32-cmake \
     -LA \
     -S . \

ports/ci/mac/build.sh

@@ -27,7 +27,7 @@ fi
 
 INSTALL_PREFIX=${PWD}/package-data
 
-mkdir build
+mkdir -p build
 cmake \
     -LA \
     -S . \

ports/ci/windows-msys/deploy.sh

@@ -22,11 +22,8 @@ git clone https://github.com/webcamoid/DeployTools.git
 
 export PATH="/c/Program Files (x86)/NSIS:/c/msys64/mingw64/bin:/mingw64/bin:${PATH}"
 export INSTALL_PREFIX="${PWD}/package-data-${COMPILER}"
-export INSTALL_PREFIX_W=$(cygpath -w "${INSTALL_PREFIX}")
 export PACKAGES_DIR="${PWD}/packages/windows-${COMPILER}"
-export PACKAGES_DIR_W=$(cygpath -w "${PACKAGES_DIR}")
 export BUILD_PATH="${PWD}/build-${COMPILER}-x64"
-export BUILD_PATH_W=$(cygpath -w "${BUILD_PATH}")
 export PYTHONPATH="${PWD}/DeployTools"
 
 /c/msys64/mingw32/bin/strip "${INSTALL_PREFIX}"/x86/*