Switch libGLESv1_CM/libGLESv2 to hash-style=both

  Old version of unity uses custom linker to link
  itself and libmono. The custom linker does not
  support lookups with gnu-hash style. Switching
  libraries needed by libunity.so to --hash-style=both
  fixes this problem.

Bug: http://b/20093774
Change-Id: I2a4887cf7a5ee80a8976ecaad54b52dc62518e55