Fix cwrapper test failure with --disable-static.

[Ralf Wildenhues]

<http://hydra.nixos.org/build/737077/log/raw>
shows among others (some of which are NixOS and not Libtool issues)
the following failure:

libtool: compile:  gcc -g -O2 -c m.c  -fPIC -DPIC -o .libs/m.o
./cwrapper.at:255: $LIBTOOL --mode=link $CC $CFLAGS $LDFLAGS -o m1$EXEEXT 
m.$OBJEXT foo/liba.la
stderr:
gcc: m.o: No such file or directory
stdout:
libtool: link: gcc -g -O2 -o .libs/m1 m.o  foo/.libs/liba.so -Wl,-rpath 
-Wl,/tmp/nix-build-j7dzmn77cw5yzw9l6d48fdqv4q18mjy0-libtool-2.4.1a.drv-0/libtool-2.4.1a/tests/testsuite.dir/057/inst/lib
./cwrapper.at:255: exit code was 1, expected 0
57. cwrapper.at:201: 57. cwrapper and installed shared libraries 
(cwrapper.at:201): FAILED (cwrapper.at:255)


which should be fixed by the patch below, which I'm pushing as obvious.

Thanks,
Ralf

    Fix cwrapper test failure with --disable-static.
    
    * tests/cwrapper.at (cwrapper and installed shared libraries):
    Compile program source without libtool, so we can be sure a
    non-PIC object will be created.

diff --git a/tests/cwrapper.at b/tests/cwrapper.at
index 6e8cf3c..0e5ecb7 100644
--- a/tests/cwrapper.at
+++ b/tests/cwrapper.at
@@ -249,8 +249,7 @@ int main (void)
 }
 ]])
 
-AT_CHECK([$LIBTOOL --mode=compile --tag=CC $CC $CPPFLAGS $CFLAGS -c m.c],
-         [], [ignore], [ignore])
+AT_CHECK([$CC $CPPFLAGS $CFLAGS -c m.c], [], [ignore], [ignore])
 
 AT_CHECK([$LIBTOOL --mode=link $CC $CFLAGS $LDFLAGS -o m1$EXEEXT m.$OBJEXT 
foo/liba.la],
          [], [ignore], [ignore])