PDF: const-qualify by-value scalar params in definitions #2738

Job	Run time
build-test-downstream (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	16m 24s
build (ubuntu-24.04, ubuntu-24.04-clang-18, android-35-x86_64, 28.1.13356709)	17m 36s
build (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	17m 50s
build (ubuntu-24.04, ubuntu-24.04-gcc-14, ubuntu-24.04-gcc-14)	6m 38s
build (macos-15, macos-15-armv8-clang-14, macos-15-armv8-clang-14)	19m 46s
build (windows-2022, windows-2022-msvc-1940, windows-2022-msvc-1940)	5m 5s
build (macos-26, macos-26-armv8-clang-14, macos-26-armv8-clang-14)	15m 43s
test (macos-26, macos-26-armv8-clang-14)	9m 5s
docker (ubuntu-24.04, ubuntu-24.04-clang-18)	21s
	1h 48m 28s

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