Remove acc_pa_risc.jam. Given that it's a copy

of acc.jam with only toolset name changed, I see
no point in having this file.


[SVN r39268]

tools/build

@@ -1 +1 @@
-Subproject commit 856a41141edd8d1d5cf6ca0beac8fb891c07cbd4
+Subproject commit 913ad3ded4dce6275435e3e284954ed15c81b645