add stats-for-supported-archs script

This script shows popularity of system calls on supported Linux
architectures.

examples/stats-for-supported-archs.py

@@ -0,0 +1,43 @@
+#!/usr/bin/python3
+
+import system_calls
+
+from system_calls.architectures_in_kernel import architectures
+
+popular_syscalls = {}
+
+syscalls = system_calls.syscalls()
+
+for arch in syscalls.archs():
+    if arch not in architectures:
+        del syscalls.syscalls["archs"][arch]
+
+
+for syscall_name in syscalls.names():
+    counter = 0
+
+    for arch in syscalls.archs():
+        try:
+            syscalls.get(syscall_name, arch)
+            counter += 1
+        except system_calls.NotSupportedSystemCall:
+            pass
+
+    try:
+        popular_syscalls[counter].append(syscall_name)
+    except KeyError:
+        popular_syscalls[counter] = []
+        popular_syscalls[counter].append(syscall_name)
+
+amount_of_archs = len(syscalls.archs())
+
+for amount in range(1, amount_of_archs + 1):
+    try:
+        tmp = popular_syscalls[amount]
+        print(f"System calls supported on {amount} of {amount_of_archs} "
+              "architectures:")
+        for syscall in popular_syscalls[amount]:
+            print(f"{syscall} ", end='')
+        print("\n")
+    except KeyError:
+        pass