Rebuild tcc for OpenBSD/amd64 release 7.8

[lcheylus]

With ABI modifications for libc and libpthread in OpenBSD version 7.8 (released in october 2025), rebuild of tcc on this version using the same commit as in the previous update.

Build of tcc for commit cb39bc4c (2025-05-27)

$ uname -mrs
OpenBSD 7.8 amd64

$ thirdparty/tcc/tcc.exe -v -v
tcc version 0.9.28rc 2025-05-27 HEAD@cb39bc4c (x86_64 OpenBSD)
install: thirdparty/tcc/lib/tcc
include:
  thirdparty/tcc/lib/tcc/include
  /usr/local/include
  /usr/include
libraries:
  thirdparty/tcc/lib/tcc
  thirdparty/tcc/lib
  /usr/lib
  /usr/local/lib
libtcc1:
  thirdparty/tcc/lib/tcc/libtcc1.a
crt:
  thirdparty/tcc/lib
  /usr/lib
elfinterp:
  /usr/libexec/ld.so

$ ldd thirdparty/tcc/tcc.exe
thirdparty/tcc/tcc.exe:
        Start            End              Type  Open Ref GrpRef Name
        000002127cc98000 000002127cd2e000 exe   2    0   0      thirdparty/tcc/tcc.exe
        0000021564f38000 0000021564f69000 rlib  0    1   0      /usr/lib/libm.so.10.1
        00000214e9ac7000 00000214e9ad4000 rlib  0    1   0      /usr/lib/libpthread.so.28.1
        0000021515170000 0000021515277000 rlib  0    1   0      /usr/lib/libc.so.102.2
        000002157626f000 000002157626f000 ld.so 0    1   0      /usr/libexec/ld.so

[spytheman]

Thank you @lcheylus 🙇🏻 .