dlsym RTLD_NEXT support for mips

untested

src/ldso/mips/dlsym.s

@@ -0,0 +1,15 @@
+.set noreorder
+.global dlsym
+.type dlsym,@function
+dlsym:
+	lui $gp, %hi(_gp_disp)
+	addiu $gp, %lo(_gp_disp)
+	addu $gp, $gp, $25
+	move $6, $ra
+	lw $25, %call16(__dlsym)($gp)
+	addiu $sp, $sp, -16
+	jalr $25
+	sw $ra, 12($sp)
+	lw $ra, 12($sp)
+	jr $ra
+	addiu $sp, $sp, 16