Rules.mak: Fix setting arch native bit

fix breakage from 603af30d

Removing the whitespace from findstring for 64 bit architectures has
bad consequences since powerpc would be a match in powerpc64 and sparc
would also be a match in sparc64.
That doesn't make them 64 bits in reality causing general breakage.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
libc/sysdeps: Fix common-generic stat.h for BE part 2

Previous patch only fixed the build. This patch fixes the behavior at
run-time as well.

It fixes "Value too large for defined data type" messages caused by
fstat syscall wrapper returning -EOVERFLOW.

Signed-off-by: Mischa Jonker <Mischa.Jonker@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>