Remove -Wno-deprecated-declarations from compiler options

All uses of deprecated functions have been replaced.

Author: tautschnig

CMakeLists.txt

@@ -78,15 +78,15 @@ if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     #   Enable lots of warnings
     set(CMAKE_CXX_FLAGS
         "${CMAKE_CXX_FLAGS} -Wall -Wpedantic -Werror -Wswitch-enum \
-         -Wno-deprecated-declarations -Wno-maybe-uninitialized")
+         -Wno-maybe-uninitialized")
 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR
        "${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
     #   Ensure NDEBUG is not set for release builds
     set(CMAKE_CXX_FLAGS_RELEASE "-O2")
     set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")
     #   Enable lots of warnings
     set(CMAKE_CXX_FLAGS
-        "${CMAKE_CXX_FLAGS} -Wall -Wpedantic -Werror -Wswitch-enum -Wno-deprecated-declarations")
+        "${CMAKE_CXX_FLAGS} -Wall -Wpedantic -Werror -Wswitch-enum")
 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
     # This would be the place to enable warnings for Windows builds, although
     # config.inc doesn't seem to do that currently

src/config.inc

@@ -6,7 +6,6 @@ ifeq ($(BUILD_ENV),MSVC)
   #CXXFLAGS += /Wall /WX
 else
   CXXFLAGS += -Wall -pedantic -Werror -Wswitch-enum
-  CXXFLAGS += -Wno-deprecated-declarations
   # GCC only, silence clang warning
   CXXFLAGS += -Wno-maybe-uninitialized -Wno-unknown-warning-option
 endif