check for __attribute__((visibility)) uncoditionally

Change-Id: Ie8f071ea2c4fc2c57278796bd74cfbc5c04306db
diff --git a/configure.ac b/configure.ac
index 554523a..8e4ea0a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,6 +36,7 @@

AX_CXX_COMPILE_STDCXX_11
AX_GCC_FUNC_ATTRIBUTE([format])
AX_GCC_FUNC_ATTRIBUTE([visibility])
DLP_FALLTHROUGH

PKG_PROG_PKG_CONFIG([0.20])
@@ -124,7 +125,6 @@
        AC_TRY_COMPILE([], [], [have_visibility=yes], [have_visibility=no])
        AC_MSG_RESULT([$have_visibility])
        CXXFLAGS="$saved_CXXFLAGS"
        AX_GCC_FUNC_ATTRIBUTE([visibility])
    ]
)
AM_CONDITIONAL([HAVE_VISIBILITY], [