Fix compilation errors when not using system boost. Might be more.
It's sad that one has to micro-manage boost use like this.
Change-Id: I3541789530fbdb0fb03e2b355144e63f8b031097
Moved portions from module i18npool, all of former i18nisolang1 library
that now is i18nlangtag. Included are languagetag, isolang and mslangid.
This i18nlangtag code is now even used by module comphelper, so
disentangling i18npool and making this an own module was needed to not
create circular module dependencies.
Change-Id: Ib887c3d6dde667403fd22d382310ba5f1a9b0015
Always link in gb_STDLIBS, except when the library explicitly opts out
with gb_LinkTarget_disable_standard_system_libs.
Change-Id: I489a99114fbfa46d0421a27cf6c7b899dc268a4a
