Use easylogging++'s stack trace facility where possible

This avoids using libunwind, which often causes trouble.

CMakeLists.txt

@@ -275,17 +275,23 @@ add_definitions("-DBLOCKCHAIN_DB=${BLOCKCHAIN_DB}")
 
 # Can't install hook in static build on OSX, because OSX linker does not support --wrap
 # On ARM, having libunwind package (with .so's only) installed breaks static link.
-if(APPLE OR (ARM AND STATIC))
+if (APPLE)
+  set(DEFAULT_STACK_TRACE OFF)
+  set(LIBUNWIND_LIBRARIES "")
+elseif(CMAKE_C_COMPILER_ID STREQUAL "GNU" AND NOT MINGW)
+  set(DEFAULT_STACK_TRACE ON)
+  set(LIBUNWIND_LIBRARIES "")
+elseif (ARM AND STATIC)
   set(DEFAULT_STACK_TRACE OFF)
   set(LIBUNWIND_LIBRARIES "")
 else()
   find_package(Libunwind)
-    if(LIBUNWIND_FOUND)
-      set(DEFAULT_STACK_TRACE ON)
-    else()
-      set(DEFAULT_STACK_TRACE OFF)
-      set(LIBUNWIND_LIBRARIES "")
-    endif()
+  if(LIBUNWIND_FOUND)
+    set(DEFAULT_STACK_TRACE ON)
+  else()
+    set(DEFAULT_STACK_TRACE OFF)
+    set(LIBUNWIND_LIBRARIES "")
+  endif()
 endif()
 
 option(STACK_TRACE "Install a hook that dumps stack on exception" ${DEFAULT_STACK_TRACE})