Improve error messages from C parser #80

Job	Run time
Linter	1m 49s
Linter	1m 49s
Generate llhttp sources	13s
Generate llhttp sources	13s
Test (3.8, ubuntu, false)	6m 14s
Test (3.8, ubuntu, false)	6m 14s
Test (3.8, windows, false)	9m 38s
Test (3.8, windows, false)	15m 50s
Test (3.8, Y, ubuntu, false)	6m 20s
Test (3.8, Y, ubuntu, false)	6m 20s
Test (3.9, ubuntu, false)	8m 19s
Test (3.9, ubuntu, false)	6m 28s
Test (3.9, macos, false)	7m 20s
Test (3.9, macos, false)	7m 17s
Test (3.9, windows, false)	6m 18s
Test (3.9, windows, false)	15m 51s
Test (3.9, Y, ubuntu, false)	6m 21s
Test (3.9, Y, ubuntu, false)	5m 25s
Test (3.10, ubuntu, false)	9m 33s
Test (3.10, ubuntu, false)	9m 33s
Test (3.10, macos, false)	7m 45s
Test (3.10, macos, false)	7m 45s
Test (3.10, windows, false)	10m 35s
Test (3.10, windows, false)	15m 20s
Test (3.10, Y, ubuntu, false)	5m 54s
Test (3.10, Y, ubuntu, false)	5m 54s
Test (pypy-3.8, Y, ubuntu, false)	5m 41s
Test (pypy-3.8, Y, ubuntu, false)	14m 21s
Test (macos, 3.11.0-alpha - 3.11.0, true, Y)	2m 18s
Test (macos, 3.11.0-alpha - 3.11.0, true, Y)	2m 17s
Test (ubuntu, 3.11.0-alpha - 3.11.0, false, Y)	5m 34s
Test (ubuntu, 3.11.0-alpha - 3.11.0, false, Y)	7m 20s
Test (windows, 3.11.0-alpha - 3.11.0, true, Y)	5m 19s
Test (windows, 3.11.0-alpha - 3.11.0, true, Y)	29m 22s
check	2s
check	2s
Pre-Deploy	0s
Pre-Deploy	0s
Tarball	0s
Tarball	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Deploy	0s
Deploy	0s
	4h 22m 34s

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