* gnu/packages/glib.scm (glib): Update to 2.37.1. Add Bash and tzdata
as inputs. Remove `glib-tests-timezone.patch'. Augment `pre-build'
phase to set `TZDIR', `XDG_CACHE_HOME', and to modify makefiles to
honor $(TESTS_ENVIRONMENT).
* gnu/packages/patches/glib-tests-desktop.patch,
gnu/packages/patches/glib-tests-homedir.patch: Update.
* gnu/packages/patches/glib-tests-timezone.patch: Remove.
* Makefile.am (dist_patch_DATA): Update accordingly.
