crossgcc: Upgrade GDB to version 8.3

Change-Id: I7a85ad171fa259e0dcb0019941d735ef41511737
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32754
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/crossgcc/patches/gdb-8.3_pythonhome.patch

@@ -0,0 +1,19 @@
+diff -urN gdb-8.2.1.orig/gdb/python/python.c gdb-8.2.1/gdb/python/python.c
+--- gdb-8.2.1.org/gdb/python/python.c	2019-01-04 12:48:32.440687758 +0100
++++ gdb-8.2.1/gdb/python/python.c	2019-01-04 12:54:09.917677688 +0100
+@@ -1727,6 +1727,15 @@
+ #endif
+ #endif
+ 
++  char readlinkbuffer[BUFSIZ];
++  int readlinks = readlink("/proc/self/exe", readlinkbuffer, BUFSIZ - 1);
++  readlinkbuffer[readlinks] = 0;
++  char *executeablepath = dirname(readlinkbuffer);
++  char *pythonhome = malloc(strlen(executeablepath) + strlen("/../") + 2);
++  strcpy(pythonhome, executeablepath);
++  strcat(pythonhome, "/../");
++  setenv("PYTHONHOME", pythonhome, 1);
++
+   Py_Initialize ();
+   PyEval_InitThreads ();
+