Remove have_fma from the public API exports. (#43854)

Author: maleadt

src/jl_exported_funcs.inc

@@ -32,7 +32,6 @@
     XX(jl_array_grow_end) \
     XX(jl_array_isassigned) \
     XX(jl_arraylen) \
-    XX(jl_have_fma) \
     XX(jl_array_ptr) \
     XX(jl_array_ptr_1d_append) \
     XX(jl_array_ptr_1d_push) \