dbghelp: Make sure NT_GNU_BUILD_ID is defined.

[Francois Gouget]

This fixes builds on Solaris 11 & 10, FreeBSD 8.1 & 7.x, Debian 4.0.
---

On Debian NT_GNU_BUILD_ID appeared in Debian 5.0 but apparently it's 
still missing on other more recent Unix platforms.

It seemed to me that providing our own definition would be fine. But 
maybe a better solution would be to make the relevant functions 'fail' 
if it's missing.

 dlls/dbghelp/elf_module.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/dbghelp/elf_module.c b/dlls/dbghelp/elf_module.c
index 80352bc..ea25b02 100644
--- a/dlls/dbghelp/elf_module.c
+++ b/dlls/dbghelp/elf_module.c
@@ -55,6 +55,9 @@
 #define ELF_INFO_DEBUG_HEADER   0x0001
 #define ELF_INFO_MODULE         0x0002
 #define ELF_INFO_NAME           0x0004
+#ifndef NT_GNU_BUILD_ID
+# define NT_GNU_BUILD_ID 3
+#endif
 
 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
 
-- 
1.7.10