tools/nolibc: MIPS: drop noreorder option

There are no more statements in the assembly code which would require
the usage of ".set noreorder".

Remove the option.

This also allows removal of the manual "nop" instruction in the
delay slot.

Suggested-by: Maciej W. Rozycki <macro@orcam.me.uk>
Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.2502172208570.65342@angie.orcam.me.uk/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Link: https://lore.kernel.org/r/20250623-nolibc-mips-n32-v3-3-6ae2d89f4259@weissschuh.net

Author: t-8ch

tools/include/nolibc/arch-mips.h

@@ -183,15 +183,11 @@ void __start(void);
 void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector __start(void)
 {
 	__asm__ volatile (
-		".set push\n"
-		".set noreorder\n"
 		"move  $a0, $sp\n"       /* save stack pointer to $a0, as arg1 of _start_c */
 		"addiu $sp, $sp, -16\n"  /* the callee expects to save a0..a3 there        */
 		"lui $t9, %hi(_start_c)\n" /* ABI requires current function address in $t9 */
 		"ori $t9, %lo(_start_c)\n"
 		"jalr $t9\n"             /* transfer to c runtime                          */
-		" nop\n"                 /* delayed slot                                   */
-		".set pop\n"
 	);
 	__nolibc_entrypoint_epilogue();
 }