[Patch] Fix android build.

[Ilya Tocar]

Hi,

On android dlerror returns const char*.
Ok for trunk?

libgomp/
        * target.c (gomp_load_plugin_for_device): Fix type of dlerror
        return value.
        (DLSYM_OPT): Ditto.
---
 libgomp/target.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libgomp/target.c b/libgomp/target.c
index 73e757a..50baa4d 100644
--- a/libgomp/target.c
+++ b/libgomp/target.c
@@ -919,7 +919,7 @@ static bool
 gomp_load_plugin_for_device (struct gomp_device_descr *device,
                             const char *plugin_name)
 {
-  char *err = NULL, *last_missing = NULL;
+  const char *err = NULL, *last_missing = NULL;
   int optional_present, optional_total;
 
   /* Clear any existing error.  */
@@ -947,7 +947,7 @@ gomp_load_plugin_for_device (struct gomp_device_descr 
*device,
 #define DLSYM_OPT(f, n)                                                \
   do                                                                   \
     {                                                                  \
-      char *tmp_err;                                                   \
+      const char *tmp_err;                                                     
\
       device->f##_func = dlsym (plugin_handle, "GOMP_OFFLOAD_" #n);    \
       tmp_err = dlerror ();                                            \
       if (tmp_err == NULL)                                             \
-- 
1.8.3.1