Fix inttypes format macros in src/processor/proc_maps_linux.cc
Fix inttypes format macros in src/processor/proc_maps_linux.cc

crrev.com/1298443002 has introduced a build failure by re-defining
__STDC_FORMAT_MACROS. Fixing it.

BUG=
R=mark@chromium.org, ted.mielczarek@gmail.com

Review URL: https://codereview.chromium.org/1303493003 .

git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@1493 4c0a9323-5329-0410-9bdc-e9ce6186880e

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