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Enable and fix additional build warnings #825

Job	Run time
Windows (Win32)	2m 41s
manyconfig	24m 34s
perl	18s
GCC -O0	1m 54s
GCC -Os, old Autotools	1m 1s
Clang (-O0)	2m 26s
GCC -O3	58s
Clang (-O2)	3m 30s
Windows (x64)	1m 52s
GCC -Os, CMake+ninja, no JIT	2m 37s
Bazel	0s
CMake unity build	54s
Check autogenerated file freshness	16s
Zig	0s
	43m 1s

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