[MIPS] Add remaining parts for building tests for MIPS

tests/data_not_executable/execute_data.c

Index: tests/data_not_executable/execute_data.c
diff --git a/tests/data_not_executable/execute_data.c b/tests/data_not_executable/execute_data.c
index bd34e51d9c235f9881e00986f1ac0ec5246dfc0b..e3ad03a74307f4261cd9558f453a3e97534cfabd 100644
--- a/tests/data_not_executable/execute_data.c
+++ b/tests/data_not_executable/execute_data.c
@@ -13,6 +13,9 @@ int main(void) {
   uint8_t code[] __attribute__((aligned(32))) = { 0xc3 /* ret */ };
 #elif defined(__arm__)
   uint32_t code[] __attribute__((aligned(32))) = { 0xe12fff1e /* BX LR */ };
+#elif defined(__mips__)
+  uint32_t code[] __attribute__((aligned(32))) = { 0x03e00008, /* JR RA */
+                                                   0           /* NOP   */ };
 #else
 # error Unknown architecture
 #endif