Fix viewer in static MSVC SeaMonkey builds.

Bug #237919 r=sdwalker

webshell/tests/viewer/Makefile.in

@@ -216,7 +216,7 @@ ifneq ($(OS_ARCH),WINNT)
 LDFLAGS        += -L$(DEPTH)/dist/lib/components
 endif # !WINNT
 EXTRA_DSO_LIBS += $(STATIC_EXTRA_DSO_LIBS)
-XP_DIST_LIBS   += $(STATIC_EXTRA_LIBS)
+EXTRA_LIBS   += $(STATIC_EXTRA_LIBS)
 DEFINES        += $(STATIC_DEFINES)
 CPPSRCS        += $(STATIC_CPPSRCS)