fixed xmlIOParseDTD handling of @input in error case, Should fix #335085

* parser.c: fixed xmlIOParseDTD handling of @input in error case,
  Should fix #335085
* testapi.c: reset the http_proxy env variable to not waste time
  on regression tests
Daniel

testapi.c

@@ -14,6 +14,7 @@
 #include <stdio.h>
 #endif
 
+#include <stdlib.h> /* for putenv() */
 #include <string.h>
 #include <libxml/xmlerror.h>
 #include <libxml/relaxng.h>
@@ -126,6 +127,9 @@ int main(int argc, char **argv) {
     int ret;
     int blocks, mem;
 
+    /* access to the proxy can slow up regression tests a lot */
+    putenv("http_proxy=");
+
     memset(chartab, 0, sizeof(chartab));
     strncpy((char *) chartab, "  chartab\n", 20);
     memset(inttab, 0, sizeof(inttab));