pnacl's newlib code contains function that can/should not be called

newlib-trunk/newlib/libc/stdlib/Makefile.in

Index: newlib-trunk/newlib/libc/stdlib/Makefile.in
===================================================================
--- a/newlib-trunk/newlib/libc/stdlib/Makefile.in
+++ b/newlib-trunk/newlib/libc/stdlib/Makefile.in
@@ -117,7 +117,7 @@
 	lib_a-wctob.$(OBJEXT)
 am__objects_5 = lib_a-putenv.$(OBJEXT) lib_a-putenv_r.$(OBJEXT) \
 	lib_a-setenv.$(OBJEXT) lib_a-setenv_r.$(OBJEXT)
-am__objects_6 = lib_a-system.$(OBJEXT)
+am__objects_6 = 
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@am__objects_7 = $(am__objects_4) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	$(am__objects_5) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	$(am__objects_6)
@@ -152,7 +152,7 @@
 	mbsrtowcs.lo on_exit.lo valloc.lo wcrtomb.lo wcsnrtombs.lo \
 	wcsrtombs.lo wctob.lo
 am__objects_12 = putenv.lo putenv_r.lo setenv.lo setenv_r.lo
-am__objects_13 = system.lo
+am__objects_13 = 
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@am__objects_14 = $(am__objects_11) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	$(am__objects_12) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	$(am__objects_13)
@@ -395,8 +395,7 @@
 	setenv.c	\
 	setenv_r.c
 
-ELIX_4_SOURCES = \
-	system.c
+ELIX_4_SOURCES = 
 
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@ELIX_SOURCES = $(ELIX_2_SOURCES) $(ELIX_3_SOURCES) $(ELIX_4_SOURCES)
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_TRUE@ELIX_SOURCES = $(ELIX_2_SOURCES) $(ELIX_3_SOURCES)
@@ -471,7 +470,6 @@
 	wcstoll.def 	\
 	wcstoul.def 	\
 	wcstoull.def 	\
-	system.def	\
 	wcstombs.def	\
 	wctomb.def