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configure: fix build on NIOS II platform

NIOS II is a CPU architecture from Altera, which uses 'nios2' as the
architecture part of the tuple. Unfortunately, 'nios2' matches the
current '*os2*' test done by libdvdread's configure script to detect
the OS/2 operating system. This leads to build issues as the build
process of libdvdread then tries to use OS/2 specific compiler
options, that do not exist in the gcc used for Linux/NIOS2.

To fix this, this patch makes the test for OS/2 a little bit more
specific: in the case of the OS/2 operating system, the OS part of the
tuple contains just 'os2' (confirmed by looking at config.guess and
config.sub in the gnuconfig project). So using '*-os2-*' will properly
match the OS/2 operating system but not the NIOS II architecture.

Upstream-status: submitted
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: b/configure.ac
===================================================================
--- a/configure.ac
+++ b/configure.ac
@@ -146,7 +146,7 @@
   *cygwin*)
     LDFLAGS="-no-undefined $LDFLAGS"
     ;;
-  *os2*)
+  *-os2-*)
     LDFLAGS="-no-undefined -Zbin-files $LDFLAGS"
     ;;
   *)