Do not use $(V) - force AM_V=1

Projects using silent-rules might otherwise fail to compile.

This is due to the following resulting Makefile code:

AM_V_P = $(am__v_P_$(V))
am__v_P_ = $(am__v_P_$(AM_DEFAULT_VERBOSITY))
am__v_P_0 = false
am__v_P_1 = :

Automake directly uses $(V) for variable name expansion
which fails if $(V) is set to sth. else other than '0' or '1'.

This patch forces automake to not take $(V) into account
but to always use the default config for verbosity.

A better approach would be to actually take $(V) into account,
however not just pass it through (AM_V='$(V)') but
set AM_V to 0 if $V=0 / unset and to 1 otherwise.

This plan however is foiled due to my frustration about
automake as well as my lack of m4 skills.

automake bug report: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20077

Signed-off-by: Mirko Vogt <mirko@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44684 3c298f89-4303-0410-b956-a3cf2f4a3e73

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