Updated c++std for bdb, boost, qt and zeromq (#905)

depends/packages/bdb.mk

@@ -10,7 +10,7 @@ $(package)_config_opts=--disable-shared --enable-cxx --disable-replication --wit
 $(package)_config_opts_mingw32=--enable-mingw
 $(package)_config_opts_linux=--with-pic
 $(package)_cflags+=-Wno-error=implicit-function-declaration
-$(package)_cxxflags=-std=c++11
+$(package)_cxxflags=-std=c++17
 $(package)_cppflags_mingw32=-DUNICODE -D_UNICODE
 endef
 

depends/packages/boost.mk

@@ -26,7 +26,7 @@ ifneq (,$(findstring clang,$($(package)_cxx)))
 endif
 $(package)_archiver_$(host_os)=$($(package)_ar)
 $(package)_config_libraries=chrono,filesystem,system,thread,test
-$(package)_cxxflags=-std=c++11 -fvisibility=hidden
+$(package)_cxxflags=-std=c++17 -fvisibility=hidden
 $(package)_cxxflags_linux=-fPIC
 $(package)_cxxflags_android=-fPIC
 endef

depends/packages/qt.mk

@@ -30,7 +30,7 @@ define $(package)_set_vars
 $(package)_config_opts_release = -release
 $(package)_config_opts_debug = -debug
 $(package)_config_opts += -bindir $(build_prefix)/bin
-$(package)_config_opts += -c++std c++11
+$(package)_config_opts += -c++std c++1z
 $(package)_config_opts += -confirm-license
 $(package)_config_opts += -hostprefix $(build_prefix)
 $(package)_config_opts += -no-compile-examples

depends/packages/zeromq.mk

@@ -8,7 +8,7 @@ $(package)_patches=0001-fix-build-with-older-mingw64.patch 0002-disable-pthread_
 define $(package)_set_vars
   $(package)_config_opts=--without-docs --disable-shared --without-libsodium --disable-curve --disable-curve-keygen --disable-perf --disable-Werror
   $(package)_config_opts_linux=--with-pic
-  $(package)_cxxflags=-std=c++11
+  $(package)_cxxflags=-std=c++17
 endef
 
 define $(package)_preprocess_cmds