libtiff: CI: test -DCMAKE_UNITY_BUILD=ON

From 4e2a38d58a0954bb9c6c738577ce48974d8eb1aa Mon Sep 17 00:00:00 2001
From: Even Rouault <[EMAIL REDACTED]>
Date: Wed, 22 Nov 2023 19:42:26 +0100
Subject: [PATCH] CI: test -DCMAKE_UNITY_BUILD=ON

---
 build/gitlab-ci | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build/gitlab-ci b/build/gitlab-ci
index c969ccfd..a0c4a418 100644
--- a/build/gitlab-ci
+++ b/build/gitlab-ci
@@ -52,8 +52,8 @@ cmake_build()
     else
         opts2=""
     fi
-    echo "Running cmake -G "$1" -DCMAKE_BUILD_TYPE="$2" -DCMAKE_INSTALL_PREFIX=../cmake-install ${opts} ${opts2} .."
-    cmake -G "$1" -DCMAKE_BUILD_TYPE="$2" -DCMAKE_INSTALL_PREFIX=../cmake-install ${opts} ${opts2}  ..
+    echo "Running cmake -G "$1" -DCMAKE_UNITY_BUILD=ON -DCMAKE_BUILD_TYPE="$2" -DCMAKE_INSTALL_PREFIX=../cmake-install ${opts} ${opts2} .."
+    cmake -G "$1" -DCMAKE_UNITY_BUILD=ON -DCMAKE_BUILD_TYPE="$2" -DCMAKE_INSTALL_PREFIX=../cmake-install ${opts} ${opts2}  ..
     $COVERITY_BUILD cmake --build .
     cmake --build . --target install
     ctest -V