jit: Fix -Wodr warning

jit: Fix -Wodr warning

gcc/jit/libgccjit.c:3957:8: warning: type 'struct version_info' violates the C++ One Definition Rule [-Wodr]

../../gcc/jit/libgccjit.c:3957:8: warning: type 'struct version_info' violates the C++ One Definition Rule [-Wodr]
 3957 | struct version_info

../../gcc/tree-ssa-loop-ivopts.c:181: note: a different type is defined in another translation unit
  181 | struct version_info

gcc/jit/ChangeLog:

	* libgccjit.c (struct version_info): Rename to jit_version_info.
	(struct jit_version_info): Likewise.
	(gcc_jit_version_major): Likewise.
	(gcc_jit_version_minor): Likewise.
	(gcc_jit_version_patchlevel): Likewise.