[NaCl SDK] Enable linux host build for nacl_io and nacl_io_tests.

native_client_sdk/src/libraries/ppapi_simple/library.dsc

Index: native_client_sdk/src/libraries/ppapi_simple/library.dsc
diff --git a/native_client_sdk/src/libraries/ppapi_simple/library.dsc b/native_client_sdk/src/libraries/ppapi_simple/library.dsc
index 8cb2c056bfee6fe2d335d665da9bc5841acf65cc..0b2683df99efa70c1782a2ff121d11a24bdc84ca 100644
--- a/native_client_sdk/src/libraries/ppapi_simple/library.dsc
+++ b/native_client_sdk/src/libraries/ppapi_simple/library.dsc
@@ -1,5 +1,5 @@
 {
-  'TOOLS': ['newlib', 'glibc', 'pnacl'],
+  'TOOLS': ['newlib', 'glibc', 'pnacl', 'linux'],

[binji, 2013/11/15 17:26:23]

not sure this is a good idea -- the first call to mount will call the real mount
function, right?

[Sam Clegg, 2013/11/15 18:13:34]

No because we intercept mount directly in syscalls/mount.c.

It only the function like fopen/fclose/etc where we intercept at the low
level that we will get failures.

For sure nacl_io will not work as expected under linux but enabling the
linux build enables us to do all this great testing.

[binji, 2013/11/15 18:21:18]

Agreed, I'm just not sure we want to turn it out for ppapi_simple. Or is it
required because the tests use it?

   'TARGETS': [
     {
       'NAME' : 'ppapi_simple',