minor CMake cleanup - use shallow option for git repo pulls

thirdparty/thirdparty.cmake

@@ -523,7 +523,11 @@ endif()
 
 #############################################
 # wxWidgets
-# The usage is a bit different on all the platforms. For having version >= 3.0, a version of cmake >= 3.0 should be used on Windows (on Linux/OSX it works properly this way).
+#
+# The usage is a bit different on all the platforms. For having
+#  version >= 3.0, a version of cmake >= 3.0 should be used on Windows
+#  on Linux/OSX it works properly this way).
+
 if(WIN32)
   # wxWidgets
   set(wxWidgets_CONFIGURATION msw CACHE STRING "Set wxWidgets configuration")
@@ -612,6 +616,7 @@ else()
     indi
     GIT_REPOSITORY https://github.com/indilib/indi.git
     GIT_TAG 856ac85b965177d23cd0c819a49fd50bdaeece60  # v2.0.5
+    GIT_SHALLOW 1
     CMAKE_ARGS -Wno-dev
       -DINDI_BUILD_SERVER=OFF
       -DINDI_BUILD_DRIVERS=OFF
@@ -721,6 +726,7 @@ if (NOT OPENSOURCE_ONLY)
     OGMAcamSDK
     GIT_REPOSITORY https://github.com/OGMAvision/OGMAcamSDK.git
     GIT_TAG 5e83d81384479b1684b97e9f6936e453050da4cb
+    GIT_SHALLOW 1
   )
   FetchContent_MakeAvailable(OGMAcamSDK)
   include_directories(${ogmacamsdk_SOURCE_DIR}/inc)