Remove the return type from the syscall lists and parser.

It's not used, so it's just noise.

Change-Id: I58260bf3f2f8513f80dc9fa59e856e4d23e4a011
diff --git a/libc/SECCOMP_BLOCKLIST_COMMON.TXT b/libc/SECCOMP_BLOCKLIST_COMMON.TXT
index 22c9844..0c6e1ae 100644
--- a/libc/SECCOMP_BLOCKLIST_COMMON.TXT
+++ b/libc/SECCOMP_BLOCKLIST_COMMON.TXT
@@ -6,5 +6,5 @@
 #
 # This file is processed by a python script named genseccomp.py.
 
-int     swapon(const char*, int) all
-int     swapoff(const char*) all
+swapon(const char*, int) all
+swapoff(const char*) all