cmake: Fixes for qurt and nuttx

Added px4_parameters.c to nuttx executable src list.
Minor syntax fix in Tools/px_generate_params.py for semicolon.
Added handling of PX4_MAIN which was not yet supoprted in the
cmake build.
Fixed include quotes in muorb_test_example.cpp

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

cmake/common/px4_base.cmake

@@ -273,6 +273,9 @@ function(px4_add_module)
 		endif()
 	endforeach()
 	foreach (prop STACK MAIN COMPILE_FLAGS LINK_FLAGS PRIORITY)
+		if ("${prop}" STREQUAL "MAIN")
+			add_definitions(-DPX4_MAIN=${${prop}}_app_main)
+		endif()
 		if (${prop})
 			set_target_properties(${MODULE} PROPERTIES "${prop}" "${${prop}}")
 		endif()