Fix inttypes.h PRI?PTR and SCN?PTR macros.

Our intptr_t and uintptr_t aren't "long". Add a compilation test so we remember
to fix this to cope with 32- and 64-bit later.

Bug: http://code.google.com/p/android/issues/detail?id=57218
Change-Id: I2f816d339edb4f7d57e4418b818fb4c602093f38
diff --git a/tests/Android.mk b/tests/Android.mk
index b7a6080..34aaec9 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -63,6 +63,7 @@
     fenv_test.cpp \
     getauxval_test.cpp \
     getcwd_test.cpp \
+    inttypes_test.cpp \
     libc_logging_test.cpp \
     libgen_test.cpp \
     malloc_test.cpp \