Add missing functions and tests for support library.

Missing functions:
rsFrac(float)
rsMatrixLoadRotate(rs_matrix4x4 *, float, float, float, float)
rsMatrixLoadScale(rs_matrix4x4 *, float, float, float)
rsMatrixLoadTranslate(rs_matrix4x4 *, float, float, float)
rsMatrixRotate(rs_matrix4x4 *, float, float, float, float)
rsMatrixScale(rs_matrix4x4 *, float, float, float)
rsMatrixTranslate(rs_matrix4x4 *, float, float, float)
rsMatrixLoadOrtho(rs_matrix4x4 *, float, float, float, float, float, float)
rsMatrixLoadFrustum(rs_matrix4x4 *, float, float, float, float, float, float)
rsMatrixLoadPerspective(rs_matrix4x4 *, float, float, float, float)
rsMatrixInverse(rs_matrix4x4 *)
rsMatrixInverseTranspose(rs_matrix4x4 *)
rsMatrixTranspose(rs_matrix4x4 *)
rsMatrixTranspose(rs_matrix3x3 *)
rsMatrixTranspose(rs_matrix2x2 *)
rsUptimeNanos()
rsGetDt()

Headers tested in this CL:
rs_element.rsh
rs_math.rsh
rs_matrix.rsh
rs_object.rsh
rs_sampler.rsh
rs_time.rsh

Change-Id: I6cb1972a44f66dc7fed8fe3cf0329720d166af81
4 files changed