This re-generates the file IID_to_MPH.c using gperf.
You need to do this after modifying either OpenSLES_IID.c or MPH.c.

Prerequisites:
 * GNU make
 * GNU gperf perfect hash generator

Usage:
Type 'make'.
Diff the old file in ../../src/autogen vs. the newly generated IID_to_MPH.c here.
If the differences look OK, then copy the new IID_to_MPH.c back to
  its stable location in ../../src/autogen using 'make install'.
Build and test the usage of the new IID.
Then do 'make clean' or 'make distclean' here.
