Add fallocate/fallocate64/posix_fallocate/posix_fallocate64.

Bug: 5287571
Bug: 12612860
Change-Id: I4501b9c6cdf9a830336ce0b3afc4ea716b6a0f6f
diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 0951648..0555983 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -169,6 +169,9 @@
 # (mmap only gets two lines because we only used the 64-bit variant on 32-bit systems.)
 void* __mmap2:mmap2(void*, size_t, int, int, int, long)   arm,mips,x86
 void* mmap|mmap64(void*, size_t, int, int, int, off_t)  arm64,x86_64
+# (fallocate only gets two lines because there is no 32-bit variant.)
+int fallocate64:fallocate(int, int, off64_t, off64_t) arm,mips,x86
+int fallocate|fallocate64(int, int, off_t, off_t) arm64,x86_64
 
 # file system
 int     chdir(const char*)              all