Fix No spread on the hl2_complete server build

The server RandomSeed GOT slot was hardcoded to 0xce1348, measured on the
older bin/server.so. The anniversary branch loads hl2_complete/bin/server.so,
whose R_386_JMP_SLOT for RandomSeed is 0xce5348, so the patch hit unrelated
writable data and no spread silently did nothing.

- Read the relocation from the loaded module's ELF (module_jump_slot) instead
  of hardcoding, with the two known offsets as fallback.
- Override whenever the RandomSeed caller's `this` is the local server player
  (CBaseEntity::FireBullets) instead of matching a hardcoded return-address
  range that also moved between builds.
- m_takedamage is a char (FIELD_CHARACTER) in the 2013 SDK; resolve it as such
  and read a byte, so the IMMUNE damage tag actually works.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index e35e737..b7fc2f5 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -278,6 +278,8 @@ int server_npc_takedamage(int idx);
 int server_npc_turret_flags(int idx);
 int server_model_index(void *base);
 void find_modules();
+bool module_jump_slot(const char *path, const char *name, uintptr_t *vaddr,
+                      uintptr_t *bias);
 void init_conmsg();
 bool feature_active(int feature);
 bool feature_has_bind(int feature);