Fix -Wunused-but-set-variable errors #1107
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Commit 4be34c4 fixed the most part of -Wunused-but-set-variable errors, but some of them were suppressed by -Wno-unused-but-set-variable flag in configure script. This patch removes this flag and fixes all the errors that emerged after. However, this error can't be fixed for the files generated by Yacc, so -Wno-unused-but-set-variable errors was set individually for them