Switch homebrew to use system hwloc and jemalloc (chapel-lang#25148)

Switches the homebrew formula in the chapel tree to use a system install
of hwloc, which allows chapel to use qthreads. This results in better
performance for users. This also uses a system install of jemalloc,
which also increases performance.

- [x] Tested locally by install chapel from the homebrew formula and
running `chpl examples/hello.chpl && ./hello`

To be merged after chapel-lang#25145 and
chapel-lang#25158

Resolves chapel-lang#24655
Resolves chapel-lang#24931

[Reviewed by @stonea]

util/packaging/homebrew/chapel-main.rb

@@ -18,6 +18,8 @@ class Chapel < Formula
 
   depends_on "cmake"
   depends_on "gmp"
+  depends_on "hwloc"
+  depends_on "jemalloc"
   depends_on "llvm@17"
   depends_on "[email protected]"
 
@@ -47,8 +49,9 @@ def install
     (libexec/"chplconfig").write <<~EOS
       CHPL_RE2=bundled
       CHPL_GMP=system
-      CHPL_MEM=cstdlib
-      CHPL_TASKS=fifo
+      CHPL_MEM=jemalloc
+      CHPL_TARGET_JEMALLOC=system
+      CHPL_HWLOC=system
       CHPL_LLVM_CONFIG=#{llvm.opt_bin}/llvm-config
       CHPL_LLVM_GCC_PREFIX=none
     EOS