hadrian: disable in-tree gmp fft code path for wasm32

This patch disables in-tree GMP FFT code paths for wasm32 target in
order to give up some performance of multiplying very large operands
in exchange for reduced code size.

(cherry picked from commit 1a32f828)
(cherry picked from commit 097ea6e2)

hadrian/src/Settings/Builders/Configure.hs

@@ -16,6 +16,10 @@ configureBuilderArgs = do
                 pure $ [ "--enable-shared=no"
                      , "--host=" ++ targetPlatform    -- GMP's host is our target
                      , "--build=" ++ buildPlatform ]
+                     -- Disable FFT logic on wasm32, sacrifice
+                     -- performance of multiplying very large operands
+                     -- to save code size
+                     <> [ "--disable-fft" | targetArch == "wasm32" ]
                      -- Disable GMP's alloca usage on wasm32, it may
                      -- cause stack overflow (#22602) due to the
                      -- rather small 64KB default stack size. See