examples : add compiler version and target to build info

[cebtenzzre]

As suggested by @staviq in #2922 (comment).
I haven't touched dump_non_result_info_yaml, llama-bench.cpp, or server.cpp.
I haven't tested on Windows, and I'm not really sure what kind of useful info I can get out of MSVC besides _MSC_VER.

Example output:

main: build = 1175 (b53cfef9)
main: built with gcc (GCC) 13.2.1 20230801 for x86_64-pc-linux-gnu
main: seed  = 1693785456

[slaren]

When building with cmake I get this:

-- Found Git: /usr/bin/git (found version "2.39.2")
_: 1: --version: not found
[ 41%] Built target BUILD_INFO

and build-info.h contains:

#define BUILD_COMPILER ""
#define BUILD_TARGET "unknown"

Which I think is from this PR.

@cebtenzzre do you know what may cause this?

[slaren]

I cleared the build directory and reconfigured and the problem disappeared, but I am still a bit confused because I had already cleared it several times before today.

[cebtenzzre]

do you know what may cause this?

That can only happen if CMAKE_C_COMPILER is not set. What is your compiler? I'm not a CMake expert, I'm not sure what I should do instead. make has $(CC) which just works.

[slaren]

My compiler is the gcc that ships with Ubuntu:

#define BUILD_COMPILER "cc (Ubuntu 12.3.0-1ubuntu1~23.04) 12.3.0"
#define BUILD_TARGET "x86_64-linux-gnu"

Maybe it was a fluke, I'll see if I can reproduce the issue again, until then please ignore this.