Fix compile issues in previous patch

tgt-vvp/eval_vec4.c

@@ -462,8 +462,8 @@ static void draw_binary_vec4_logical(ivl_expr_t expr, char op)
 	    jmp_type = "1";
 	    break;
 	  default:
-	    opcode = "<invalid>"
-	    jmp_type = "<invalid>"
+	    opcode = "<invalid>";
+	    jmp_type = "<invalid>";
 	    assert(0);
 	    break;
       }

vpi_modules.cc

@@ -17,6 +17,7 @@
  *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#include <cstring>
 #include "config.h"
 #include "compiler.h"
 #include "vpi_user.h"
@@ -126,7 +127,7 @@ s_vpi_vecval vpip_calc_clog2(vpiHandle)
 }
 void        vpip_count_drivers(vpiHandle, unsigned, unsigned [4]) { }
 void        vpip_format_strength(char*, s_vpi_value*, unsigned) { }
-char*       vpip_format_pretty(vpiHandle) { return "invalid"; }
+char*       vpip_format_pretty(vpiHandle) { return strdup("invalid"); }
 void        vpip_make_systf_system_defined(vpiHandle) { }
 void        vpip_mcd_rawwrite(PLI_UINT32, const char*, size_t) { }
 void        vpip_set_return_value(int) { }