This fixes the errors when trying to assemble .s files using GitMake on OS X.

Change-Id: I2221f558619302d22e0c57d7203173d634155678
Signed-off-by: NMike Bland <mbland@acm.org>
Signed-off-by: NGeoff Thorpe <geoff@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>