Switch last few benchmarks over to using SCALE_FACTOR.

Most of the benchmarks define a constant SCALE_FACTOR that controls
how many times we should repeat the benchmark.  This patch brings the
last few benchmarks into line.

ChangeLog:

	* 2dfir/fir2dim.c (SCALE_FACTOR): Added.
	(main) Switch to use SCALE_FACTOR.
	* blowfish/bf.c: Likewise.
	* crc32/crc_32.c: Likewise.
	* cubic/basicmath_small.c: Likewise.
	* dijkstra/dijkstra_small.c: Likewise.
	* fdct/fdct.c: Likewise.
	* float_matmult/matmult.c: Likewise.
	* int_matmult/matmult.c: Likewise.
	* rijndael/aesxam.c: Likewise.
	* sha/sha_driver.c: Likewise.
Merge int_matmult and float_matmult into a single test directory.

These two tests are almost identical except one is on integers and
the other is on floats, and the input data is different.

Merge the tests into a single test directory, share a common source
file, and generate the two binaries there.

ChangeLog:

	* configure.ac: Remove int_matmult and float_matmult, add matmult.
	* configure: Regenerate.
	* src/float_matmult/Makefile.in: Removed.
	* src/float_matmult/matmult.c: Removed.
	* src/float_matmult/Makefile.am: Removed.
	* src/int_matmult/Makefile.am: Removed.
	* src/int_matmult/Makefile.in: Removed.
	* src/int_matmult/matmult.c: Removed.
	* src/matmult/Makefile.am: New file.
	* src/matmult/Makefile.in: New file.
	* src/matmult/matmult.c: New file.
Merge branch 'beebsv2' of https://github.com/mageec/beebs into stoil