Ensures that we do not apply empty sed expression which might happen
when building native recipe
Cc: jan vermaete <jan.vermaete@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
FFTW_CC is added to image via version.o and its CC + CFLAGS however CC
in OE containes --syroot compiler option which encodes buildpaths into
binary, therefore remove this option from FFTW_CC in config.h
Signed-off-by: Khem Raj <raj.khem@gmail.com>
