[PATCH] add definitions for global variables to shell.c

[Robert Schiele <rschiele@gmail.com>]

Commit 5b8e6f85 introduced stubs for three functions that make no sense
for git-shell.  But those stubs defined libgit.a functions a second time
so that a linker can complain.  While commit 78568448 fixes this problem
it introduces a new issue on the affected systems: Some versions of the
Sun compiler generate references to global variables when they see
extern declarations for those, even when they are never used in the
code.

This patch does a similar workaround for this problem as commit 5b8e6f85
did for the functions.

Signed-off-by: Robert Schiele <rschiele@gmail.com>
---
 shell.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/shell.c b/shell.c
index 6a48de0..8902ea5 100644
--- a/shell.c
+++ b/shell.c
@@ -3,12 +3,17 @@
 #include "exec_cmd.h"
 #include "strbuf.h"
 
-/* Stubs for functions that make no sense for git-shell. These stubs
- * are provided here to avoid linking in external redundant modules.
+/* Stubs for functions and external variables that make no sense for
+ * git-shell. These stubs are provided here to avoid linking in
+ * external redundant modules.
  */
 void release_pack_memory(size_t need, int fd){}
 void trace_argv_printf(const char **argv, const char *fmt, ...){}
 void trace_printf(const char *fmt, ...){}
+int trust_executable_bit;
+const unsigned char null_sha1[20];
+const signed char hexval_table[256];
+int has_symlinks;
 
 
 static int do_generic_cmd(const char *me, char *arg)
-- 
1.5.4.5