* gnu/packages/bioinformatics.scm (bowtie): Add 'supported-systems' field and
add Makefile patch.
* gnu/packages/patches/bowtie-fix-makefile.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/bioinformatics.scm (samtools): disable tests for all non-64-bit
systems because of an upstream bug in the test data.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>