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/miscutils/bc.c b/miscutils/bc.c
index a82646674..31485ae9c 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -203,6 +203,9 @@
 
 #include "libbb.h"
 #include "common_bufsiz.h"
+#if ENABLE_PLATFORM_MINGW32
+# include "BB_VER.h"
+#endif
 
 #if !ENABLE_BC && !ENABLE_FEATURE_DC_BIG
 # include "dc.c"