Fix cmake policy

PKGBUILD

@@ -7,7 +7,7 @@
 epoch=1
 pkgname=dsview
 pkgver=1.3.2
-pkgrel=2
+pkgrel=3
 pkgdesc="Client software that supports the DreamSourceLab logic analyzer"
 arch=('i686' 'x86_64')
 url="http://www.dreamsourcelab.com/"
@@ -36,6 +36,7 @@ build() {
         -GNinja \
         -DCMAKE_BUILD_TYPE='None' \
         -DCMAKE_INSTALL_PREFIX='/usr' \
+        -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
         -Wno-dev
     cmake --build build
 }