Use LIBS iso. LDFLAGS for sqlite3 func checks

Author: erlend-aasland

configure

@@ -4220,7 +4220,6 @@ WITH_SAVE_ENV([
 dnl bpo-45774/GH-29507: The CPP check in AC_CHECK_HEADER can fail on FreeBSD,
 dnl hence CPPFLAGS instead of CFLAGS.
   CPPFLAGS="$CPPFLAGS $LIBSQLITE3_CFLAGS"
-  LDFLAGS="$LIBSQLITE3_LIBS $LDFLAGS"
   LIBS="$LIBSQLITE3_LIBS $LIBS"
 
   AC_CHECK_HEADER([sqlite3.h], [