Fix heap test binaries build

[disconnect3d]

It turns out we never build the heap test binaries with their expected build flags. Instead, we always build and used the binaries build by wildcard rules in makefile: %.out: %.c

Ugh... and now I think some tests on CI will fail because we may not be able to load the binaries or have their dependencies? Let's see.

[disconnect3d]

Yeah..:

$ gdb /home/dc/pwndbg/tests/binaries/heap_bugs.out
pwndbg: loaded 200 commands. Type pwndbg [filter] for a list.
pwndbg: created $rebase, $ida gdb functions (can be used with print/break)
Reading symbols from /home/dc/pwndbg/tests/binaries/heap_bugs.out...
------- tip of the day (disable with set show-tips off) -------
Use the canary command to see all stack canary/cookie values on the stack (based on the *usual* stack canary value initialized by glibc)
pwndbg> r
Starting program: /home/dc/pwndbg/tests/binaries/heap_bugs.out 
/bin/bash: line 1: /home/dc/pwndbg/tests/binaries/heap_bugs.out: No such file or directory
During startup program exited with code 127.
pwndbg> 

[disconnect3d]

And here's my local reason why it crashes:

user@user:~/pwndbg/tests/binaries$ /home/user/pwndbg/tests/binaries/heap_bins.out
/home/user/pwndbg/tests/binaries/heap_bins.out: /home/user/pwndbg/tests/binaries/glibcs/2.33/libc.so.6: version `GLIBC_2.34' not found (required by /home/user/pwndbg/tests/binaries/heap_bins.out)

Apparently gcc/clang sucks? I mean, u can't force libc symbol version during compilation.

Or.. at least I have tried. I have also tried patchelf with clear symbol versions etc. as suggested in https://stackoverflow.com/questions/2856438/how-can-i-link-to-a-specific-glibc-version

But it still does not work fully as some other symbols (in other sections) are left there with the newer (2.34) glibc version.

So what can we do? Apparently if we compile with ZIG's programming language compiler, it works? O_o

I mean, sth like this: zig cc <rpath flags> <dynamic interp flag> -target native-native-gnu.2.33 -lc test.c. Adding this in next commit.