Fix a method redefinition warning in C parser #714

Job	Run time
Ruby memcheck	58s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	52s
ubuntu-22.04 3.0	30s
ubuntu-22.04 3.1	36s
ubuntu-22.04 3.2	30s
ubuntu-22.04 3.3	33s
ubuntu-22.04 3.4	29s
ubuntu-22.04 head	1m 20s
ubuntu-22.04 jruby	1m 8s
ubuntu-22.04 jruby-head	1m 13s
macos-13 2.7	1m 43s
macos-13 3.0	36s
macos-13 3.1	43s
macos-13 3.2	34s
macos-13 3.3	37s
macos-13 3.4	36s
macos-13 head	30s
macos-13 jruby	1m 28s
macos-13 jruby-head	1m 28s
macos-14 2.7	47s
macos-14 3.0	23s
macos-14 3.1	24s
macos-14 3.2	17s
macos-14 3.3	19s
macos-14 3.4	45s
macos-14 head	18s
macos-14 jruby	38s
macos-14 jruby-head	38s
windows-latest 2.7	3m 49s
windows-latest 3.0	2m 9s
windows-latest 3.1	3m 7s
windows-latest 3.2	2m 58s
windows-latest 3.3	2m 52s
windows-latest 3.4	3m 55s
windows-latest head	1m 41s
windows-latest mswin	1m 19s
ubuntu-latest jruby-9.4	1m 6s
macos-latest truffleruby-head	34s
ubuntu-latest truffleruby-head	2m 5s
	46m 31s

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