sim: warnings: fix -Wreturn-mismatch typo

sim/configure

diff --git a/sim/configure b/sim/configure
index af37e1d..faa26e4 100755
--- a/sim/configure
+++ b/sim/configure
@@ -15845,7 +15845,7 @@
 -Wold-style-declaration
 -Wold-style-definition
 -Wpointer-sign
--WWreturn-mismatch
+-Wreturn-mismatch
 -Wstrict-prototypes
 -Wno-enum-conversion
 "

sim/m4/sim_ac_option_warnings.m4

diff --git a/sim/m4/sim_ac_option_warnings.m4 b/sim/m4/sim_ac_option_warnings.m4
index bdb99c4..555bdb0 100644
--- a/sim/m4/sim_ac_option_warnings.m4
+++ b/sim/m4/sim_ac_option_warnings.m4
@@ -68,7 +68,7 @@
 -Wold-style-declaration
 -Wold-style-definition
 -Wpointer-sign
--WWreturn-mismatch
+-Wreturn-mismatch
 -Wstrict-prototypes
 dnl The cgen virtual insn logic involves enum conversions.
 dnl Disable until we can figure out how to make this work.