Simplify URL decoding logic to reduce binary size

src/macros.inc

@@ -425,20 +425,11 @@ parse_request:
   jge        .400 ; invalid url
 
   ; %xx blocks to ascii
-  mov        bx, word [r10 + rcx - 1] ; keep in mind it's still in LE
-  or         rbx, 0010000000100000b
-  bt         rbx, 6+8
-  ; setc       al
-  ; shl        rax, 8
-  setc       ah
-  bt         rbx, 6
-  setc       al
-  mov        rdx, 39
-  mul        rdx ; rax * 39 -> rdx:rax
-  sub        rbx, rax
-  and        rbx, 0000111100001111b
-  shl        bh, 4
-  rol        bx, 4 ; fix the order
+  mov        bl, byte [r10 + rcx - 2]
+  mov        bh, byte [r10 + rcx - 1]
+  sub        bl, '0'
+  sub        bh, '0'
+  mov        bl, bl * 16 + bh
   jmp        .loop
 
 .no_hex:

src/main.asm

@@ -324,12 +324,6 @@ start:
   Syscall SYS_accept4, r14, NULL, NULL, SOCK_NONBLOCK
   cmp     rax, 0
   jge     @f
-
-  ; this just means another thread already handled this
-  cmp     rax, -EAGAIN ; EWOULDBLOCK also aliases to EAGAIN on linux
-  je      .switch_end
-
-  error   20, "failed to accept connection"
 @@:
 
   push    rax ; fd