syntax: functions require return type. remove `->`

The purpose of this is:

 * Only one way to do things
 * Changing a function with void return type to return a possible
   error becomes a 1 character change, subtly encouraging
   people to use errors.

See #632

Here are some imperfect sed commands for performing this update:

remove arrow:

```
sed -i 's/\(\bfn\b.*\)-> /\1/g' $(find . -name "*.zig")
```

add void:

```
sed -i 's/\(\bfn\b.*\))\s*{/\1) void {/g' $(find ../ -name "*.zig")
```

Some cleanup may be necessary, but this should do the bulk of the work.

1 files changed, 4 insertions, 4 deletions

diff --git a/std/endian.zig b/std/endian.zig
index 4e67cfc7a5..121505d24d 100644
--- a/std/endian.zig
+++ b/std/endian.zig
@@ -1,19 +1,19 @@
 const mem = @import("mem.zig");
 const builtin = @import("builtin");
 
-pub fn swapIfLe(comptime T: type, x: T) -> T {
+pub fn swapIfLe(comptime T: type, x: T) T {
     return swapIf(builtin.Endian.Little, T, x);
 }
 
-pub fn swapIfBe(comptime T: type, x: T) -> T {
+pub fn swapIfBe(comptime T: type, x: T) T {
     return swapIf(builtin.Endian.Big, T, x);
 }
 
-pub fn swapIf(endian: builtin.Endian, comptime T: type, x: T) -> T {
+pub fn swapIf(endian: builtin.Endian, comptime T: type, x: T) T {
     return if (builtin.endian == endian) swap(T, x) else x;
 }
 
-pub fn swap(comptime T: type, x: T) -> T {
+pub fn swap(comptime T: type, x: T) T {
     var buf: [@sizeOf(T)]u8 = undefined;
     mem.writeInt(buf[0..], x, builtin.Endian.Little);
     return mem.readInt(buf, T, builtin.Endian.Big);