Optimization level

[Neal H Walfield]

What is the right way to change the optimization level without editing
Makeconf?  Consider the following:

        address@hidden:~/build (0)$ CFLAGS=-O1 make
        set -e; gcc -O -O1  -Wall -g -O3  -I. ...
                    ---^

Thanks to hurd/Makeconf, which appends its flags (thereby killing the
user's -O):

        CFLAGS += -Wall -g -O3

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