cgen error for `myfile &C.FILE` field of a struct instance, that is later explicitly freed

[spytheman]

V version: V 0.4.11 f073169, press to see full `v doctor` output

V full version	V 0.4.11 fa49b76.f073169
OS	linux, Ubuntu 20.04.6 LTS
Processor	4 cpus, 64bit, little endian, Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz
Memory	0.63GB/15.05GB
V executable	/home/delian/v/v
V last modified time	2025-09-17 06:13:32
V home dir	OK, value: /home/delian/v
VMODULES	OK, value: /home/delian/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/delian/v
env VFLAGS	"-no-parallel"
Git version	git version 2.50.0
V git status	weekly.2025.38-10-g14ef7651
.git/config present	true
cc version	cc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
gcc version	gcc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
clang version	N/A
tcc version	tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
tcc git status	thirdparty-linux-amd64 696c1d84
emcc version	N/A
glibc version	ldd (Ubuntu GLIBC 2.31-0ubuntu9.18) 2.31

What did you do?
./v -g -o vdbg cmd/v && ./vdbg /home/delian/code/misc/2025_09_17__09/a.v && /home/delian/code/misc/2025_09_17__09/a

struct Abc {
	myfile &C.FILE = unsafe { nil }
}

a := Abc{}
unsafe { a.free() }

What did you see?

================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/a.01K5B509RGCZRHC5TKWZZF5C7J.tmp.c:662: warning: implicit declaration of function 'builtin__FILE_free'
cc: /home/delian/v/thirdparty/tcc/lib/libgc.a: error: 'GC_noop1_ptr' defined twice
cc: tcc: error: undefined symbol 'builtin__FILE_free'
=================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).

What did you expect to see?

a compiled program, that does not call builtin__FILE_free

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