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testsuite: fix testwsdeque with recent clang

Cheng Shao requested to merge type-dance/ghc:testwsdeque into master

This patch fixes compilation of testwsdeque.c with recent versions of clang, which will fail with the error below:

testwsdeque.c:95:33: error:
     warning: format specifies type 'long' but the argument has type 'void *' [-Wformat]
       95 |         barf("FAIL: %ld %d %d", p, n, val);
          |                     ~~~         ^

testwsdeque.c:95:39: error:
     warning: format specifies type 'int' but the argument has type 'StgWord' (aka 'unsigned long') [-Wformat]
       95 |         barf("FAIL: %ld %d %d", p, n, val);
          |                            ~~         ^~~
          |                            %lu

testwsdeque.c:133:42: error:
     error: incompatible function pointer types passing 'void (void *)' to parameter of type 'OSThreadProc *' (aka 'void *(*)(void *)') [-Wincompatible-function-pointer-types]
      133 |         createOSThread(&ids[n], "thief", thief, (void*)(StgWord)n);
          |                                          ^~~~~

/workspace/ghc/_build/stage1/lib/../lib/x86_64-linux-ghc-9.11.20240502/rts-1.0.2/include/rts/OSThreads.h:193:51: error:
     note: passing argument to parameter 'startProc' here
      193 |                                     OSThreadProc *startProc, void *param);
          |                                                   ^

2 warnings and 1 error generated.

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