hexagon: Make `fma` label local to avoid symbol collision
The `fma:` label in dffma.s was being exported as a global symbol
causing a "symbol 'fma' is already defined" error when linking with
libm's `fma` function.
Unfortunately rust-lang/compiler-builtins#682 removed `.global fma` but
didn't address the implicit global export of the label itself.
--- old.txt 2026-01-30 20:31:37.265844316 -0600
+++ new.txt 2026-01-30 20:31:46.531950264 -0600
@@ -1,4 +1,3 @@
-00000000 t fma
00000000 T __hexagon_fmadf4
00000000 T __hexagon_fmadf5
00000000 T __qdsp_fmadf5
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