export XBPS_BINPKG_EXISTS rather than mark it as readonly #11874
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srcpkg_get_version and srcpkg_get_pkgver require unsetting
XBPS_BINPKG_EXISTS to work properly (e.g. without it, some packages have
a trailing -). Unfortunately, bash does not allow unsetting readonly
variables, which XBPS_BINPKG_EXISTS is exported as in xbps-src.
To resolve this problem, simply export XBPS_BINPKG_EXISTS as a normal
variable rather than marking it as readonly. This addresses #11740.