[PATCH] configure: Use cross compiler for EXCESS_PRECISION_CFLAGS check when available.

[Jacek Caban]

Signed-off-by: Jacek Caban 
---
In my case, -fexcess-precision=standard was found supported by my 
default native default compiler (GCC), but later used on clang cross 
compiler causing a warning.

configure.ac | 8 +++++++-
  1 file changed, 7 insertions(+), 1 deletion(-)