libfixmath for cortex m0

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What steps will reproduce the problem?
1. keil uvision
2. #define FIXMATH_NO_64BIT
3. code does not use the available 32 x 32 HW 1cycle multiply

Cortex M0+ does not have the M3 4 multipy, however it has a 32bit HW multiply

Windows 7


In reality the FIXMATH_NO_64BIT does not compile with Keil uVusuib. It's OK 
with std 64 mul (after a few changes to make the compiler happy)
I was thinking of maybe changing fix16_mul, although I'm not sure how.
But are there other places where the same thing happens?
Thanks!

Original issue reported on code.google.com by AGorge2...@gmail.com on 7 Sep 2013 at 11:33