Add "minsrc" target to build tarball

This adds a new target that will build the "minsrc" tarball.

It can be created on any platform now, either from the command
line or from within the Window's and Mac's project files.

The output tarball will be in the build directory.

And it's very easy to update the list of files/directories to
exclude...see scripts/CMakeLists.txt

src/CMakeLists.txt

@@ -1235,23 +1235,6 @@ elseif( CMAKE_SYSTEM_NAME MATCHES "Darwin" )
    set( HAVE_VISIBILITY 1 )
    configure_file( audacity_config.h.in private/configmac.h )
 
-   # Extract the version information
-   file( STRINGS ${_SRCDIR}/Audacity.h output
-      REGEX
-         "^#define +AUDACITY_(VERSION|RELEASE|REVISION|MODLEVEL) +"
-   )
-
-   # And store as variables
-   foreach( line ${output} )
-      string( REGEX MATCHALL "[A-Za-z0-9_]+" line "${line}" )
-      list( GET line 1 name )
-      list( GET line 2 value )
-      set( ${name} ${value} )
-   endforeach()
-
-   set( AUDACITY_DIST_VERSION ${AUDACITY_VERSION}.${AUDACITY_RELEASE}.${AUDACITY_REVISION} )
-   set( AUDACITY_INFO_VERSION ${AUDACITY_VERSION}.${AUDACITY_RELEASE}.${AUDACITY_REVISION}.${AUDACITY_MODLEVEL} )
-
    # Copy the wxWidgets libraries into the bundle
    if( "${CMAKE_GENERATOR}" MATCHES "Xcode" )
       add_custom_command(
@@ -1337,24 +1320,6 @@ endif()
 
 set_target_property_all( ${TARGET} RUNTIME_OUTPUT_NAME ${_EXE} )
 
-if (GIT_FOUND)
-   execute_process(
-      COMMAND
-         ${GIT_EXECUTABLE} show -s "--format=\"%H\";\"%cd\";"
-      WORKING_DIRECTORY
-         ${TARGET_ROOT}
-      OUTPUT_VARIABLE
-         output
-   )
-
-   list( GET output 0 long )
-   list( GET output 1 time )
-   list( APPEND DEFINES
-      REV_LONG=${long}
-      REV_TIME=${time}
-   )
-endif()
-
 organize_source( "${TARGET_ROOT}/.." "include" "${HEADERS}" )
 organize_source( "${TARGET_ROOT}/../presets" "presets" "${RESOURCES}" )
 organize_source( "${TARGET_ROOT}" "src" "${SOURCES}" )