GNU Radio 3.8 support

https://wiki.gnuradio.org/index.php/GNU_Radio_3.8_OOT_Module_Porting_Guide

Change-Id: I23dd638c8c48ed0a4b50559ce33fbd5e60b7dcbc
diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index ed0fe3d..f9b8b40 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -53,7 +53,7 @@
 if(NOT RST2MAN_EXECUTABLE)
     message(WARNING "rst2man from python-docutils is required to build man pages")
 else()
-    build_man_page(MAN1_OUTPUT grgsm_livemon.rst grgsm_livemon.1)
+    #build_man_page(MAN1_OUTPUT grgsm_livemon.rst grgsm_livemon.1)
     install(FILES ${MAN1_OUTPUT} DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man1)
 endif()