[MIPS] Fix missing definitions for MIPS arch in build and driver scripts

pnacl/driver/pnacl-driver.py

Index: pnacl/driver/pnacl-driver.py
diff --git a/pnacl/driver/pnacl-driver.py b/pnacl/driver/pnacl-driver.py
index c56d900ec253656158c59b5febb0b61af967b737..7cc5cf37547053bea705c4259effdfa991372756 100755
--- a/pnacl/driver/pnacl-driver.py
+++ b/pnacl/driver/pnacl-driver.py
@@ -56,6 +56,7 @@ EXTRA_ENV = {
 
   'BIAS_NONE'   : '',
   'BIAS_ARM'    : '-D__arm__ -D__ARM_ARCH_7A__ -D__ARMEL__',
+  'BIAS_MIPS32' : '-D__MIPS__ -D__mips__ -D__MIPSEL__ -U__MIPSEB__',

[Mark Seaborn, 2013/02/13 19:17:52]

Setting both __MIPSEL__ (little endian) and __MIPSEB__ (big endian) doesn't seem
to make sense.  Remove __MIPSEB__, since PNaCl assumes little endian?

[petarj, 2013/02/13 20:45:02]

On 2013/02/13 19:17:52, Mark Seaborn wrote:

It's "-U__MIPSEB__", not "-D__MIPSEB__".

[Mark Seaborn, 2013/02/13 20:53:17]

Oh, I didn't notice that.  But still, we shouldn't need to undefine it, surely,
any more than we need -U__i386__?  It shouldn't be defined to begin with, should
it?

[petarj, 2013/02/14 01:06:52]

I have removed it now as I can not recall why we put it originally
there, and from the smoke testing I have just done, it seems that it
is not needed.

   'BIAS_X8632'  : '-D__i386__ -D__i386 -D__i686 -D__i686__ -D__pentium4__',
   'BIAS_X8664'  : '-D__amd64__ -D__amd64 -D__x86_64__ -D__x86_64 -D__core2__',
   'FRONTEND_TRIPLE' : 'le32-unknown-nacl',