This is the followup patch. This adds more information to the package
when any imported packages have a pkgpath symbol that is not the
obvious transformation of the pkgpath. This is enough to determine
the right symbol name to use in all cases. Bootstrapped and ran Go
testsuite on x86_64-unknown
There was bug in the fix for PR 61880: it only worked fully correctly
for code compiled with -fgo-pkgpath. For code that used -fgo-prefix,
or that used neither option, the '.' separating the prefix and the
package name was converted to an underscore, which did not happen
before. This broke SWIG a
