Set USDT argument constraint for all architectures

This sets the USDT argument constraint for all architectures
rather than just restricting it to powerpc and x86 variants.
However, the other architectures might still need additional
argument parsing support.
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>

tests/python/include/folly/tracing/StaticTracepoint-ELF.h

@@ -20,7 +20,7 @@
 #ifndef FOLLY_SDT_ARG_CONSTRAINT
 #if defined(__powerpc64__) || defined(__powerpc__)
 #define FOLLY_SDT_ARG_CONSTRAINT      "nQr"
-#elif defined(__x86_64__) || defined(__i386__)
+#else
 #define FOLLY_SDT_ARG_CONSTRAINT      "nor"
 #endif
 #endif