fix commit 3fe5d80512ec5dbfbb2ee7dbb426be7d582e262e

[Shunichi Fuji]

>http://source.winehq.org/git/wine.git/?a=commit;h=3fe5d80512ec5dbfbb2ee7dbb426be7d582e262e
>configure: Check for ESound, FreeType, GPhoto2 and SANE even if their 'xxx-config' tool is missing.

if xxx-config is missing, and header and libs exist,
these lines export libs nothing even that are needed at least.
succeed in AC_CHECK_LIB, then, we will export by AC_SUBST.
so, this patch assumes that the minimum required libs are based on used to AC_CHECK_LIB.


BTW i noticed that ac_sane_libs uses '--ldflags' to get libs.
is this legal for $ac_***_libs usage?
i also attached 'use --libs' patch.

FYI, i got following for sane-config
>$ sane-config --ldflags
>-L/usr/lib  -Wl,-rpath,/usr/lib
>$ sane-config --libs
>-lsane -lusb -lpthread -lm  -ljpeg -ltiff -lieee1284 -ldl

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