Add symbols injected by some builds with PGI compilers.

tests/test_exported_symbols.in

@@ -33,7 +33,7 @@ if [ x"$lt_cv_nm_interface" = x"BSD nm" ]; then
 # ignore symbols nagfor injects into our shared objects
 /^${exp_sym_prefix}\(__NAGf90_\|f90_\)/b
 # ignore symbols pgfortran/pgcc injects into our shared objects
-/^${exp_sym_prefix}\(__get_xmmreg\|__pgdbg_stub\|__pgi_trace\|__set_xmmreg\|__pgi_data_section_start\)/b
+/^${exp_sym_prefix}\(__get_xmmreg\|__pgdbg_stub\|__pgi_trace\|__set_xmmreg\|__pgi_data_section_start\|_mp_preinit\)/b
 # skip symbols that conform to name prefix xt_
 /^${exp_sym_prefix}_*[Xx][Tt]_/b
 # also skip symbols mangled by asan