configure: removing "-c" from check_compile()

The C compiler argument "-c" in check_compile() prevents the linker
from running. As a result, due to C implicit function definition,
check_compile() will report false-positives even if a function does
not exist at all. This commit removes it.

Signed-off-by: Tom Li <tomli@tomli.me>

configure

@@ -18,7 +18,7 @@ check_compile() {
 	printf "checking %s ... " "$1"
 	printf "$3" > "$tmpc"
 	local res=0
-	$CC $OUR_CPPFLAGS $CPPFLAGS $2 $CFLAGS -c "$tmpc" -o /dev/null >/dev/null 2>&1 \
+	$CC $OUR_CPPFLAGS $CPPFLAGS $2 $CFLAGS "$tmpc" -o /dev/null >/dev/null 2>&1 \
 	|| res=1
 	test x$res = x0 && \
 	{ printf "yes\n" ; test x"$2" = x || OUR_CPPFLAGS="$OUR_CPPFLAGS $2" ; } \