Update thirdparty/libbacktrace from libbacktrace project

[lcheylus]

Describe the bug

Sources for thirdparty/libbacktrace have not been updated since May 2022 => PR #14277 by @nedpals

Master repository for libbacktrace have commits since this date of import in thirdparty => https:/ianlancetaylor/libbacktrace/

Reproduction Steps

• Clone V sources from Git
• git log thirdparty/libbacktrace

Expected Behavior

thirdparty/libbacktrace sources synced with https:/ianlancetaylor/libbacktrace/

Current Behavior

No issue with current version of thirdparty/libbacktrace

Possible Solution

• Sync thirdparty/libbacktrace sources with https:/ianlancetaylor/libbacktrace/
• Use "amalgamation" to merge libbacktrace sources in an unique file thirdparty/libbacktrace/base.c

Additional Information/Context

No response

V version

V 0.4.7 c866e37

Environment details (OS name and version, etc.)

V full version: V 0.4.7 c866e37
OS: openbsd, 7.6, GENERIC.MP#312
Processor: 2 cpus, 64bit, little endian

getwd: /home/fox/dev/vlang.git
vexe: /home/fox/dev/vlang.git/v
vexe mtime: 2024-09-20 08:44:43

vroot: OK, value: /home/fox/dev/vlang.git
VMODULES: OK, value: /home/fox/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.46.1
Git vroot status: weekly.2024.37-32-g7af312c5
.git/config present: true

CC version: OpenBSD clang version 16.0.6
thirdparty/tcc status: thirdparty-openbsd-amd64 8205cc59

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[lcheylus]

@nedpals You imported libbacktrace for Vlang in PR #14277 (May 2020). We would like to update it.

Please could you describe the process to create C sources for thirdparty/libbacktrace:

• how to split code in darwin.c, linux.c and windows.c (included in backtrace.c)
• how to use "amalgamation" to generate an unique base.c file from libbacktrace C sources

[nedpals]

@lcheylus I honestly am not sure anymore how I did this as I have not worked on V nor any low-level work for more than a year now. Can't help with you that, I'm sorry.

@spaceface777 also helped in the process so he may be able to help you with that.