builder: disable LTO on 64 bit mingw

LTO on 64 bit mingw still produces segfaulting binaries.

Turn off LTO for just that platform and leave it enabled for all other
platforms.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

tools/builder/core.sh

@@ -2611,6 +2611,7 @@ build_project() {
     puts "${NL}Building project: $CHECKOUT${NL}${NL}"
 
     target_os=${CROSS_OS:-$os}
+    target_bits=${target_bits:-$bits}
 
     dist_pre_build project
 
@@ -2619,8 +2620,14 @@ build_project() {
 
     rm -f visualboyadvance-m.exe
 
-    # FIXME: turn LTO back on when everything works
-    echo_eval_run cmake "'$CHECKOUT'" $REQUIRED_CMAKE_ARGS -DVBAM_STATIC=ON -DENABLE_LTO=ON $CMAKE_BASE_ARGS $PROJECT_ARGS $@
+    lto=ON
+
+    # FIXME: LTO still broken on 64 bit mingw
+    if [ "$target_os" = windows ] && [ "$target_bits" = 64 ]; then
+        lto=OFF
+    fi
+
+    echo_eval_run cmake "'$CHECKOUT'" $REQUIRED_CMAKE_ARGS -DVBAM_STATIC=ON -DENABLE_LTO=${lto} $CMAKE_BASE_ARGS $PROJECT_ARGS $@
     echo_run make -j$NUM_CPUS VERBOSE=1
 
     if [ "$target_os" = mac ]; then