fix git-revision.h generation: output to build tree and add missing dependencies

Generate git-revision.h into CMAKE_BINARY_DIR/src/ (which is in the
include path) instead of the source tree. Remove the header from
add_executable() source lists, and add missing add_dependencies on
git_revision for all Qt5/Qt6 targets.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/git_revision.sh

@@ -1,13 +1,18 @@
 #!/bin/bash
 
+# Usage: git_revision.sh <output_dir>
+# Generates git-revision.h in the specified output directory.
+
+OUTPUT_DIR="${1:-.}"
+
 echo "-- Generating header for git hash"
-GIT_HEADER="src/git-revision.h"
-[ -d src ] || mkdir src
+GIT_HEADER="${OUTPUT_DIR}/git-revision.h"
+[ -d "${OUTPUT_DIR}" ] || mkdir -p "${OUTPUT_DIR}"
 
 GIT_BRANCH=`git rev-parse --abbrev-ref HEAD`
 
 GIT_VERSION=`git log -n 1 --pretty=format:"%ad - %h"`
-if [ "$(grep -ics "$GIT_VERSION" $GIT_HEADER)" = 1 ] 
+if [ -f "$GIT_HEADER" ] && [ "$(grep -cs "$GIT_VERSION" "$GIT_HEADER")" = 1 ]
 then
    echo "-- No need to generate new $GIT_HEADER - git hash is unchanged"
    exit 0;