depends: always configure with --with-pic

We currently do this sporadically. Not only amongst packages, but across
OS's, i.e sometimes it's done for BSDs/Android, and sometimes not.

Configure with `--with-pic` globally instead. I think this generally
makes more sense, and should not have any downsides.

See related discussion in
https://github.com/bitcoin/bitcoin/pull/28846#discussion_r1399123100.

depends/packages/libXau.mk

@@ -10,7 +10,6 @@ $(package)_dependencies=xproto
 define $(package)_set_vars
   $(package)_config_opts=--disable-shared --disable-lint-library --without-lint
   $(package)_config_opts += --disable-dependency-tracking --enable-option-checking
-  $(package)_config_opts_linux=--with-pic
 endef
 
 define $(package)_preprocess_cmds