mems & leaks

- define_start: set above preprocess_start because now
  preprocess_start is defining macros.

- free "cmd_include_files"
- free defines always (after error-longjmps)
- close all files (after error-longjmps)
- tccpe.c: free imports always
- libtcc.c: call tcc_memstats only after all states have
  been deleted.

tccpe.c

@@ -770,6 +770,16 @@ found_dll:
     return s;
 }
 
+void pe_free_imports(struct pe_info *pe)
+{
+    int i;
+    for (i = 0; i < pe->imp_count; ++i) {
+        struct pe_import_info *p = pe->imp_info[i];
+        dynarray_reset(&p->symbols, &p->sym_count);
+    }
+    dynarray_reset(&pe->imp_info, &pe->imp_count);
+}
+
 /*----------------------------------------------------------------------------*/
 static void pe_build_imports(struct pe_info *pe)
 {
@@ -861,9 +871,7 @@ static void pe_build_imports(struct pe_info *pe)
             ent_ptr += sizeof (ADDR3264);
         }
         dll_ptr += sizeof(IMAGE_IMPORT_DESCRIPTOR);
-        dynarray_reset(&p->symbols, &p->sym_count);
     }
-    dynarray_reset(&pe->imp_info, &pe->imp_count);
 }
 
 /* ------------------------------------------------------------- */
@@ -1897,6 +1905,8 @@ ST_FUNC int pe_output_file(TCCState *s1, const char *filename)
 #endif
     }
 
+    pe_free_imports(&pe);
+
 #ifdef PE_PRINT_SECTIONS
     pe_print_sections(s1, "tcc.log");
 #endif