[PATCH] configure: replace ${CXXLAGS} with ${CXXFLAGS_for_sh}

[Tomi Ollila]

Variable CXXLAGS expands to nothing, CXXFLAGS something unusable
here; CXXFLAGS_for_sh expands to what we expect here.
---

I was palying with a patch set that enables 'set -eu' in usable way
when I noticed this...

 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 09e009b34115..0cbd64b1d26b 100755
--- a/configure
+++ b/configure
@@ -380,7 +380,7 @@ int main(int argc, char** argv) {
    Xapian::WritableDatabase db("test.db",Xapian::DB_CREATE_OR_OPEN);
 }
 EOF
-    ${CXX} ${CXXLAGS} ${xapian_cxxflags} _default_backend.cc -o _default_backend ${xapian_ldflags}
+    ${CXX} ${CXXFLAGS_for_sh} ${xapian_cxxflags} _default_backend.cc -o _default_backend ${xapian_ldflags}
     ./_default_backend
     if [ -f test.db/iamglass ]; then
 	default_xapian_backend=glass
-- 
2.6.4