tools/perf: Add empty Build files for architectures lacking them

[Ben Hutchings]

perf currently fails to build on MIPS as there is no
tools/perf/arch/mips/Build file.  Adding an empty file fixes this as
there are no MIPS-specific sources to build.

It looks like the same is needed for Alpha and PA-RISC, though I
haven't been able to test those.

Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Fixes: 5e8c0fb6a957 ("perf build: Add arch x86 objects building")
---
--- /dev/null
+++ b/tools/perf/arch/alpha/Build
@@ -0,0 +1 @@
+# empty
--- /dev/null
+++ b/tools/perf/arch/mips/Build
@@ -0,0 +1,1 @@
+# empty
--- /dev/null
+++ b/tools/perf/arch/parisc/Build
@@ -0,0 +1 @@
+# empty

-- 
Ben Hutchings
Logic doesn't apply to the real world. - Marvin Minsky

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