minor grammar fix for die message
dynamically filter EAPI specific functions

This replaces our hardcoded INTERNAL_FUNCS workaround for only exporting
EAPI specific functions when necessary with a dynamic solution that
generates a list of EAPI specific functions that shouldn't be exported
when the build environment is initialized for each ebuild.

Fixes #9.
make sure generate_eapi_func_list.bash has exec privs
eapi6: initial EAPI 6 profile
eapi6: initial get_libdir implementation

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=463586
eapi6: add .txz unpacking support

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=458102
eapi6: initial eapply implementation

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=463768
eapi6: initial eapply_user implementation

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=475288
eapi6: initial PATCHES support in src_prepare

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=463692
eapi6: mark dohtml as deprecated (not part of spec?)
eapi6: add support for econf/einstall --docdir and --htmldir (todo)

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=468202
eapi6: initial einstalldocs implementation

HTML_DOCS support might be tacked on later if that becomes part of the
spec.

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=459692
eapi6: add directory support for DOCS

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=481980
eapi6: add support for explicitly disabling DOCS install

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=463736
eapi6: add global failglob setting support (todo)

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=463822
eapi6: ban einstall

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=524112
eapi6: initial nonfatal die support

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=451938
eapi6: initial unpack() absolute path support settings (todo)

X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=483244