Update POCO to 1.11.0

vendor/POCO/build/config/Linux

@@ -1,7 +1,7 @@
 #
 # Linux
 #
-# Make settings for Linux 2.6/gcc 3.3
+# Make settings for Linux/gcc
 #
 #
 
@@ -10,6 +10,8 @@
 #
 LINKMODE ?= SHARED
 
+SANITIZEFLAGS ?=
+
 #
 # Define Tools
 #
@@ -21,7 +23,7 @@ RANLIB  = ${CROSS_COMPILE}ranlib
 SHLIB   = $(CXX) -shared -Wl,-soname,$(notdir $@) -o $@
 SHLIBLN = $(POCO_BASE)/build/script/shlibln
 STRIP   = ${CROSS_COMPILE}strip
-DEP     = $(POCO_BASE)/build/script/makedepend.gcc 
+DEP     = $(POCO_BASE)/build/script/makedepend.gcc
 SHELL   = sh
 RM      = rm -rf
 CP      = cp
@@ -36,13 +38,13 @@ SHAREDLIBLINKEXT = .so
 #
 # Compiler and Linker Flags
 #
-CFLAGS          = -std=c99
+CFLAGS          = $(SANITIZEFLAGS) -std=c11
 CFLAGS32        =
 CFLAGS64        =
-CXXFLAGS        = -Wall -Wno-sign-compare
+CXXFLAGS        = $(SANITIZEFLAGS) -std=c++14 -Wall -Wno-sign-compare
 CXXFLAGS32      =
 CXXFLAGS64      =
-LINKFLAGS       =
+LINKFLAGS       = $(SANITIZEFLAGS)
 LINKFLAGS32     =
 LINKFLAGS64     =
 STATICOPT_CC    =