Fix verification for wine repository

Signed-off-by: Diego Giovane Pasqualin <dpasqualin@c3sl.ufpr.br>

windows-installer/install-essencials.sh

@@ -3,12 +3,16 @@
 REQUIRED_PKGS="wine gcc-mingw-w64 p7zip-full autoconf"
 pkgs_to_install=""
 for pkg in $REQUIRED_PKGS; do
-    if ! dpkg --get-selections $pkg | grep -q -w install$; then
+    if ! dpkg --get-selections $pkg | grep -q -w 'install$'; then
         pkgs_to_install="$pkgs_to_install $pkg"
     fi
 done
 
-test -z $pkgs_to_install || sudo add-apt-repository ppa:ubuntu-wine/ppa || sudo update apt-get installsudo apt-get install $pkgs_to_install -y
+if test -n "$pkgs_to_install"; then
+    sudo add-apt-repository ppa:ubuntu-wine/ppa
+    sudo apt-get update update
+    sudo apt-get install $pkgs_to_install -y
+fi
 
 required_wine_pkgs="/tmp/nsis-2.45.exe /tmp/python-2.7.5.msi /tmp/py2exe.exe /tmp/pywin32.exe /tmp/wmi.exe"