newlib: fix extract process for custom version

newlib: fix extract process for custom version

If the user specifies the use of a custom newlib version, the logic in the
extract function was reversed, so this step would fail.

Signed-off-by: Trevor Woerner <trevor.woerner@linaro.org>
[yann.morin.1998@free.fr: keep leading indentation]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <c727adf1b7bd2c1e891d.1393353347@openSUSE-i7>
Patchwork-Id: 324060

diff -ru ltrace-0.5.3.orig/sysdeps/linux-gnu/Makefile ltrace-0.5.3/sysdeps/linux-gnu/Makefile

--- ltrace-0.5.3.orig/sysdeps/linux-gnu/Makefile	2009-07-25 17:13:02.000000000 +0200

+++ ltrace-0.5.3/sysdeps/linux-gnu/Makefile	2010-01-01 22:20:45.000000000 +0100

@@ -2,6 +2,7 @@

 				-e s/i.86/i386/ \

 				-e s/sun4u/sparc64/ \

 				-e s/sparc64/sparc/ \

+				-e s/alpha.*/alpha/ \

 				-e s/arm.*/arm/ \

 				-e s/sa110/arm/ \

 				-e s/ppc64/ppc/ \