Add build time and git head strings to CBuildConfig

refs #902

src/blackconfig/blackconfig.pro

@@ -17,4 +17,13 @@ SOURCES +=  *.cpp
 DESTDIR = $$DestRoot/lib
 OTHER_FILES += buildconfig_gen.cpp.in
 
+win32: GIT_BIN = $$system($$(SYSTEMROOT)\system32\where git 2> nul)
+else: GIT_BIN = $$system(which git 2> /dev/null)
+
+isEmpty(GIT_BIN) {
+    GIT_HEAD_SHA1="<unknown>"
+} else {
+    GIT_HEAD_SHA1=$$system(git rev-parse --short HEAD)
+}
+
 load(common_post)