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/libevent.mk

@@ -11,11 +11,6 @@ define $(package)_set_vars
   $(package)_config_opts=--disable-shared --disable-openssl --disable-libevent-regress --disable-samples
   $(package)_config_opts += --disable-dependency-tracking --enable-option-checking
   $(package)_config_opts_release=--disable-debug-mode
-  $(package)_config_opts_linux=--with-pic
-  $(package)_config_opts_freebsd=--with-pic
-  $(package)_config_opts_netbsd=--with-pic
-  $(package)_config_opts_openbsd=--with-pic
-  $(package)_config_opts_android=--with-pic
   $(package)_cppflags_mingw32=-D_WIN32_WINNT=0x0601
 
   ifeq ($(NO_HARDEN),)