build system: avoid full rebuild when EXTRAVERSION changes

The last two commits allow EXTRAVERSION to track the current state
of a git repository.  The build system was unable to determine
which files were affected by changes to EXTRAVERSION and caused
a full rebuild when it changed.

Alter how the version information is passed to the code so only
a handful of files need to be rebuilt when it changes.

1 files changed, 3 insertions, 0 deletions

diff --git a/libbb/messages.c b/libbb/messages.c
index 3c9d8683a..12079a2e0 100644
--- a/libbb/messages.c
+++ b/libbb/messages.c
@@ -5,6 +5,9 @@
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 #include "libbb.h"
+#if ENABLE_PLATFORM_MINGW32
+# include "BB_VER.h"
+#endif
 
 /* allow version to be extended, via CFLAGS */
 #ifndef BB_EXTRA_VERSION