Backport patch for Musl libc

Allows musl to compile for mipsel targets.

https://www.openwall.com/lists/musl/2019/09/27/1/2

Author: LemonBoy

lib/libc/musl/src/setjmp/mips/longjmp.S

@@ -12,18 +12,12 @@ longjmp:
 	addu    $2, $2, 1
 1:
 #ifndef __mips_soft_float
-	lwc1    $20, 56($4)
-	lwc1    $21, 60($4)
-	lwc1    $22, 64($4)
-	lwc1    $23, 68($4)
-	lwc1    $24, 72($4)
-	lwc1    $25, 76($4)
-	lwc1    $26, 80($4)
-	lwc1    $27, 84($4)
-	lwc1    $28, 88($4)
-	lwc1    $29, 92($4)
-	lwc1    $30, 96($4)
-	lwc1    $31, 100($4)
+	l.d     $f20, 56($4)
+	l.d     $f22, 64($4)
+	l.d     $f24, 72($4)
+	l.d     $f26, 80($4)
+	l.d     $f28, 88($4)
+	l.d     $f30, 96($4)
 #endif
 	lw      $ra,  0($4)
 	lw      $sp,  4($4)

lib/libc/musl/src/setjmp/mips/setjmp.S

@@ -22,18 +22,12 @@ setjmp:
 	sw      $30, 40($4)
 	sw      $28, 44($4)
 #ifndef __mips_soft_float
-	swc1    $20, 56($4)
-	swc1    $21, 60($4)
-	swc1    $22, 64($4)
-	swc1    $23, 68($4)
-	swc1    $24, 72($4)
-	swc1    $25, 76($4)
-	swc1    $26, 80($4)
-	swc1    $27, 84($4)
-	swc1    $28, 88($4)
-	swc1    $29, 92($4)
-	swc1    $30, 96($4)
-	swc1    $31, 100($4)
+	s.d     $f20, 56($4)
+	s.d     $f22, 64($4)
+	s.d     $f24, 72($4)
+	s.d     $f26, 80($4)
+	s.d     $f28, 88($4)
+	s.d     $f30, 96($4)
 #endif
 	jr      $ra
 	li      $2, 0