[CMAKE] Fix warning about redefinition of NDEBUG on release builds

"-DNDEBUG" will result in NDEBUG being defined as 0. To define it to nothing, like we do in our code, it must be "-DNDEBUG="

Author: tkreuzer

dll/3rdparty/libpng/CMakeLists.txt

@@ -1,7 +1,7 @@
 
 add_definitions(
     -DWIN32
-    -DNDEBUG
+    -DNDEBUG=
     -D_WINDOWS
     -DPNG_BUILD_DLL)
 

dll/3rdparty/libtiff/CMakeLists.txt

@@ -1,7 +1,7 @@
 
 add_definitions(
     -DWIN32
-    -DNDEBUG
+    -DNDEBUG=
     -DUSE_WIN32_FILEIO
     -DTIF_PLATFORM_CONSOLE)
 

dll/opengl/glu32/CMakeLists.txt

@@ -8,7 +8,7 @@ include_directories(BEFORE
 
 add_definitions(
     -DBUILD_GLU32
-    -DNDEBUG
+    -DNDEBUG=
     -DLIBRARYBUILD
     -DRESOLVE_3D_TEXTURE_SUPPORT)
 

overrides-gcc.cmake

@@ -1,8 +1,8 @@
 foreach(lang C CXX ASM)
   set(CMAKE_${lang}_FLAGS_DEBUG "")
-  set(CMAKE_${lang}_FLAGS_MINSIZEREL "-Os -DNDEBUG")
+  set(CMAKE_${lang}_FLAGS_MINSIZEREL "-Os -DNDEBUG=")
   set(CMAKE_${lang}_FLAGS_RELEASE "")
-  set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO "-O2 -g -DNDEBUG")
+  set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO "-O2 -g -DNDEBUG=")
   set(CMAKE_${lang}_IMPLICIT_LINK_LIBRARIES "")
   set(CMAKE_${lang}_IMPLICIT_LINK_DIRECTORIES "")
 endforeach()

sdk/cmake/gcc.cmake

@@ -141,7 +141,7 @@ endif()
 # Optimizations
 # FIXME: Revisit this to see if we even need these levels
 if(CMAKE_BUILD_TYPE STREQUAL "Release")
-    add_compile_options(-O2 -DNDEBUG)
+    add_compile_options(-O2 -DNDEBUG=)
 else()
     if(OPTIMIZE STREQUAL "1")
         add_compile_options(-Os)