Avoid the incompatible pointer type compiler error

Ben Corbyrequested to merge
bcorby/vala:main into main

This enables vala to be compiled using gcc >= 14 or clang >= 16 with: CFLAGS="-DVALA_STRICT_C" ./autogen.sh

Defining VALA_STRING_C disables the work around (!369 (merged)) for the incompatible-pointer-types compiler error.

Fix #951, #1409, #1630 & #1408 (partial)

Edited by Ben Corby

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