[pmc2c] Fix warnings caused by tt631_part2 branch merge. The code had been generating the necessary prototypes for the Default PMC, but no others.  It is needed elsewhere, too. This fixes the following warnings: ./src/pmc/managedstruct.c:1089: warning: implicit declaration of function 'Parrot_UnManagedStruct_update_vtable' ./src/pmc/managedstruct.c:1100: warning: implicit declaration of function 'Parrot_UnManagedStruct_ro_update_vtable' (Those warnings turn into errors under a C++ compiler.)
[pmc2c] Fix warnings caused by tt631_part2 branch merge.
The code had been generating the necessary prototypes for the Default PMC, but no others.  It is needed elsewhere, too.
This fixes the following warnings:
./src/pmc/managedstruct.c:1089: warning: implicit declaration of function 'Parrot_UnManagedStruct_update_vtable'
./src/pmc/managedstruct.c:1100: warning: implicit declaration of function 'Parrot_UnManagedStruct_ro_update_vtable'
(Those warnings turn into errors under a C++ compiler.)

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@38537 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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