Fix math library detection to use autotools helper

Remove cache memory usage assertions as single objects can be larger than the cache size
Decompose font matrix transformations into a couple of helper routines. Return all metrics in font space.
Eliminate compiler warning
Expect glyph metrics to be in font space. Compute text extents by fetching one glyph metric at a time, transforming to user space and computing the overall bounding box.
use 'sincos' where available. Scale factors now ensure the non-scale transform is area preserving. Scale factors requires another parameter to mark the fixed axis.
Change license to LGPL Mark int32x32_64_mul as broken (which it still is)
Ensure each glyph is located as close to the specified position as possible
interface change to _cairo_matrix_compute_scale_factors

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