Makefile: interface flags fixed

am/src/platform/nemu/trm.c

@@ -22,6 +22,7 @@ void halt(int code) {
   while (1);
 }
 
+
 void _trm_init() {
   heap_alloc_ptr = heap.start;
   int ret = main(mainargs);

am/src/riscv/nemu/start.S

@@ -5,4 +5,7 @@
 _start:
   mv s0, zero
   la sp, _stack_pointer
-  jal _trm_init
+
+  lui t0, %hi(_trm_init)   # Load upper 20 bits
+  addi t0, t0, %lo(_trm_init)  # Add lower 12 bits
+  jalr ra, t0, 0           # Jump and link register