crossgcc: Update GDB patch version to 7.4.1

libgen.h dont have to be included.

Change-Id: I46a6a23a310b20784de956a577f1ab3c7931e34d
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: zbao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/1470
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/crossgcc/patches/gdb-7.4.1_pythonhome.patch

@@ -0,0 +1,19 @@
+diff -ur gdb-7.4.1.orig/gdb/python/python.c gdb-7.4.1/gdb/python/python.c
+--- gdb-7.4.1.orig/gdb/python/python.c	2012-01-15 02:04:05.000000000 +0800
++++ gdb-7.4.1/gdb/python/python.c	2012-08-21 15:11:32.000000000 +0800
+@@ -1273,6 +1273,15 @@
+ 			     SLASH_STRING, "python", NULL));
+ #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 ();
+