[headers 9] Add src/libc64/ and new "z64" rand.h (#2164)

* rand.h -> libc64/qrand.h

* Add rand.h with z64 rand wrappers

* yeet comment

* code/rand.c -> libc64/qrand.c

* fixup

* move libc64 source to src/libc64/

* fix

* bss

* update file splits disasm metadata

src/code/z_actor.c

@@ -1,6 +1,7 @@
 #include "global.h"
 #include "fault.h"
 #include "quake.h"
+#include "rand.h"
 #include "terminal.h"
 
 #include "overlays/actors/ovl_Arms_Hook/z_arms_hook.h"

src/libc64/qrand.c

@@ -41,7 +41,7 @@
  *
  * @note Original name: qrand.c
  */
-#include "rand.h"
+#include "libc64/qrand.h"
 #include "z64math.h"
 
 #define RAND_MULTIPLIER 1664525

src/overlays/actors/ovl_Fishing/z_fishing.c

@@ -15,7 +15,7 @@
 #include "cic6105.h"
 #endif
 
-#pragma increment_block_number "gc-eu:141 gc-eu-mq:141 gc-jp:143 gc-jp-ce:143 gc-jp-mq:143 gc-us:143 gc-us-mq:143"
+#pragma increment_block_number "gc-eu:140 gc-eu-mq:140 gc-jp:142 gc-jp-ce:142 gc-jp-mq:142 gc-us:142 gc-us-mq:142"
 
 #define FLAGS ACTOR_FLAG_4