merge bitcoin#22840: fix unoptimized libraries in depends

Author: kwvg

depends/packages/bdb.mk

@@ -15,7 +15,7 @@ $(package)_config_opts_netbsd=--with-pic
 $(package)_config_opts_openbsd=--with-pic
 $(package)_config_opts_android=--with-pic
 $(package)_cflags+=-Wno-error=implicit-function-declaration
-$(package)_cxxflags=-std=c++17
+$(package)_cxxflags+=-std=c++17
 $(package)_cppflags_mingw32=-DUNICODE -D_UNICODE
 endef
 

depends/packages/boost.mk

@@ -27,7 +27,7 @@ else
 $(package)_toolset_$(host_os)=gcc
 endif
 $(package)_config_libraries=filesystem,test
-$(package)_cxxflags=-std=c++11
+$(package)_cxxflags+=-std=c++11
 $(package)_cxxflags_linux=-fPIC
 $(package)_cxxflags_freebsd=-fPIC
 $(package)_cxxflags_openbsd=-fPIC

depends/packages/zeromq.mk

@@ -16,7 +16,7 @@ define $(package)_set_vars
   $(package)_config_opts_netbsd=--with-pic
   $(package)_config_opts_openbsd=--with-pic
   $(package)_config_opts_android=--with-pic
-  $(package)_cxxflags=-std=c++17
+  $(package)_cxxflags+=-std=c++17
 endef
 
 define $(package)_preprocess_cmds