Link CBuildConfig and CVersion into static library blackconfig

CBuildConfig including private keys etc. should not be part of a
public library API. Therefore link it into a static library, which
is not available to end users.

refs #645

src/blackconfig/blackconfig.pro

@@ -0,0 +1,23 @@
+load(common_pre)
+
+TARGET = blackconfig
+TEMPLATE = lib
+CONFIG += staticlib
+
+buildconfig_gen.input = buildconfig_gen.cpp.in
+buildconfig_gen.output = $$DestRoot/buildconfig_gen.cpp
+GENERATED_SOURCES += $$DestRoot/buildconfig_gen.cpp
+QMAKE_SUBSTITUTES += buildconfig_gen
+
+INCLUDEPATH += ..
+precompile_header:!isEmpty(PRECOMPILED_HEADER) {
+    DEFINES += USING_PCH
+}
+
+DEFINES += LOG_IN_FILE
+HEADERS +=  *.h
+SOURCES +=  *.cpp
+DESTDIR = $$DestRoot/lib
+OTHER_FILES += buildconfig_gen.cpp.in
+
+load(common_post)