[PATCH 1/2] build-sys: use AC_USE_SYSTEM_EXCEPTIONS before trying to compile anything

[fsateler@xxxxxxxxxx (Felipe Sateler)]

This silences a warning:
configure.ac:89: warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 1bcdda6..db5b3dc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -84,9 +84,9 @@ AM_PROG_CC_C_O
 # Only required if you want the WebRTC canceller -- no runtime dep on
 # libstdc++ otherwise
 AC_PROG_CXX
+AC_USE_SYSTEM_EXTENSIONS
 AX_CXX_COMPILE_STDCXX_11([ext],[optional])
 AC_PROG_GCC_TRADITIONAL
-AC_USE_SYSTEM_EXTENSIONS
 
 # M4
 
-- 
2.9.3