vpx_integer.h: define __STDC_LIMIT_MACROS
vpx_integer.h: define __STDC_LIMIT_MACROS

fixes --enable-coefficient-range-checking --enable-debug
vp9_idct.h has references to INT16_MIN/MAX; this header is included in
c++ source so needs to request the macros

Change-Id: I2e643eb973c2d84729fa3cf2f4c4d8bf65cfdff0

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