Reland "Remove the return type from the syscall lists and parser."

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

The previous attempt missed the call to grep in the .bp file that also
needed to be updated.

Bug: http://b/395691391
Bug: http://b/395732439
Change-Id: Ia0cc2e1882280e87a569acbaace9d84e753aad80
diff --git a/libc/SECCOMP_ALLOWLIST_APP.TXT b/libc/SECCOMP_ALLOWLIST_APP.TXT
index 80b15b2..a46a33c 100644
--- a/libc/SECCOMP_ALLOWLIST_APP.TXT
+++ b/libc/SECCOMP_ALLOWLIST_APP.TXT
@@ -4,59 +4,59 @@
 # This file is processed by a python script named genseccomp.py.
 
 # Needed for debugging 32-bit Chrome
-int	pipe(int pipefd[2])	lp32
+pipe(int pipefd[2])	lp32
 
 # b/34651972
-int	access(const char *pathname, int mode)	lp32
-int	stat64(const char*, struct stat64*)	lp32
+access(const char *pathname, int mode)	lp32
+stat64(const char*, struct stat64*)	lp32
 
 # b/34813887
-int	open(const char *path, int oflag, ... ) lp32,x86_64
-int	getdents(unsigned int fd, struct linux_dirent *dirp, unsigned int count) lp32,x86_64
+open(const char *path, int oflag, ... ) lp32,x86_64
+getdents(unsigned int fd, struct linux_dirent *dirp, unsigned int count) lp32,x86_64
 
 # b/34719286
-int	eventfd(unsigned int initval, int flags)	lp32
+eventfd(unsigned int initval, int flags)	lp32
 
 # b/34817266
-int	epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)	lp32
+epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)	lp32
 
 # b/34908783
-int	epoll_create(int size)	lp32
+epoll_create(int size)	lp32
 
 # b/34979910
-int	creat(const char *pathname, mode_t mode)	lp32
-int	unlink(const char *pathname)	lp32
+creat(const char *pathname, mode_t mode)	lp32
+unlink(const char *pathname)	lp32
 
 # b/35059702
-int	lstat64(const char*, struct stat64*)	lp32
+lstat64(const char*, struct stat64*)	lp32
 
 # b/35217603
-int	fcntl(int fd, int cmd, ... /* arg */ )	lp32
-pid_t	fork()	lp32
-int	poll(struct pollfd *fds, nfds_t nfds, int timeout)	lp32
+fcntl(int fd, int cmd, ... /* arg */ )	lp32
+fork()	lp32
+poll(struct pollfd *fds, nfds_t nfds, int timeout)	lp32
 
 # b/35906875
-int	inotify_init()	lp32
-uid_t	getuid()	lp32
+inotify_init()	lp32
+getuid()	lp32
 
 # b/36435222
-int	remap_file_pages(void *addr, size_t size, int prot, size_t pgoff, int flags)	lp32
+remap_file_pages(void *addr, size_t size, int prot, size_t pgoff, int flags)	lp32
 
 # b/36449658
-int	rename(const char *oldpath, const char *newpath)	lp32
+rename(const char *oldpath, const char *newpath)	lp32
 
 # b/36726183. Note arm does not support mmap
-void*	mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)	x86
+mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)	x86
 
 # b/37769298
-int dup2(int oldfd, int newfd)	lp32
+dup2(int oldfd, int newfd)	lp32
 
 # b/62779795
-int compat_select:_newselect(int n, unsigned long* inp, unsigned long* outp, unsigned long* exp, struct timeval* timeout) lp32
+compat_select:_newselect(int n, unsigned long* inp, unsigned long* outp, unsigned long* exp, struct timeval* timeout) lp32
 
 # b/62090571
-int mkdir(const char *pathname, mode_t mode)	lp32
+mkdir(const char *pathname, mode_t mode)	lp32
 
 # Not used by bionic in U because riscv64 doesn't have it, but still
 # used by legacy apps (http://b/254179267).
-int renameat(int, const char*, int, const char*)  arm,x86,arm64,x86_64
+renameat(int, const char*, int, const char*)  arm,x86,arm64,x86_64