Describes predefine macros for mbed online compiler (armcc)

Revision:
6:40e873bbc5f7
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed/.bld/bldrc	Thu Mar 16 21:58:09 2017 +0900
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+http://mbed.org/users/mbed_official/code/mbed/builds/093f2bd7b9eb
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