mscoree/tests: Fix some format-overflow warnings.

dlls/mscoree/tests/comtest.c

@@ -71,7 +71,7 @@ static BOOL write_resource_file(const char *path_tmp, const char *name_res, cons
 static BOOL compile_cs_to_dll(char *source_path, char *dest_path)
 {
     const char *path_csc = "C:\\windows\\Microsoft.NET\\Framework\\v2.0.50727\\csc.exe";
-    char cmdline[MAX_PATH];
+    char cmdline[2 * MAX_PATH + 74];
     char path_temp[MAX_PATH];
     PROCESS_INFORMATION pi;
     STARTUPINFOA si = { 0 };