File require_cxx17.patch of Package cups-filters

Index: cups-filters-1.28.15/configure.ac
===================================================================
--- cups-filters-1.28.15.orig/configure.ac
+++ cups-filters-1.28.15/configure.ac
@@ -52,7 +52,7 @@ AH_BOTTOM([
 # ===========================
 AC_PROG_CC
 AC_PROG_CXX
-AX_CXX_COMPILE_STDCXX([11],[noext],[mandatory])
+AX_CXX_COMPILE_STDCXX([17],[noext],[mandatory])
 AM_PROG_CC_C_O
 AM_ICONV
 AC_PROG_CPP
@@ -807,7 +807,7 @@ AS_IF([test x"$enable_werror" = "xyes"],
 ])
 AS_IF([test x"$GCC" = "xyes"], [
 	# Be tough with warnings and produce less careless code
-	CFLAGS="$CFLAGS -Wall -std=gnu11"
+	CFLAGS="$CFLAGS -Wall"
 	CXXFLAGS="$CXXFLAGS -Wall " # -Weffc++" # TODO: enable when it does not print 1MB of warnings
 ])
 CFLAGS="$CFLAGS -D_GNU_SOURCE"
Index: cups-filters-1.28.15/Makefile.am
===================================================================
--- cups-filters-1.28.15.orig/Makefile.am
+++ cups-filters-1.28.15/Makefile.am
@@ -526,7 +526,7 @@ pdftopdf_SOURCES = \
 pdftopdf_CFLAGS = \
 	$(LIBQPDF_CFLAGS) \
 	$(CUPS_CFLAGS)
-pdftopdf_CXXFLAGS = -std=c++0x $(pdftopdf_CFLAGS)   # -std=c++11
+pdftopdf_CXXFLAGS = $(pdftopdf_CFLAGS)
 pdftopdf_LDADD = \
 	$(LIBQPDF_LIBS) \
 	$(CUPS_LIBS)