update to 0.21.1 release

Include doc and man pages for envsubst subpackage.
runtime to gettext package.

Add conflicts to enable new (sub)packages installable independently of the original package.

Introduce envsubst sub-package for allow install envsubst with minimal

Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild

separate out gettext-runtime from the main package into a subpackage

add Provides: gettext-runtime to gettext package for forward compatibility.
and removed Provides: gettext-tools

add Provides: gettext-tools to gettext package for forward compatibility.

add Java 17 support patch from Mamoru Tasaka (#2062407)

fix gettext snapshot versioning issue to make it canonical (#2061646)

Rebuild with gettext-snapshot-20220228 to fix ppc64le and tests (#2045414)
0.21-gnulib-perror-tests.patch as it is upstreamed.

Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild

update autotools files with autoreconf to fix FTBFS (#2000426)

Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild

Rebuild with new binutils to fix ppc64le corruption (#1960730)

Add gettext-0.21-covscan.patch to fix issues detected by static analyzers