cmake: added optimization and at the same time added the beta-NMR lib.

src/external/TLemRunHeader/CMakeLists.txt

@@ -36,6 +36,9 @@ target_include_directories(
   TLemRunHeader BEFORE PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
 )
 
+#--- add compile options for optimization -------------------------------------
+target_compile_options(TLemRunHeader PUBLIC -O3)
+
 #--- add library dependencies -------------------------------------------------
 target_link_libraries(TLemRunHeader ${ROOT_LIBRARIES})