!5 [sync] PR-4: Force C++14 as this code is not C++17 ready

From: @openeuler-sync-bot 
Reviewed-by: @leeffo 
Signed-off-by: @leeffo

htmlcxx.spec

@@ -1,6 +1,6 @@
 Name:           htmlcxx
 Version:        0.86
-Release:        1
+Release:        2
 License:        LGPLv2 and GPLv2+ and ASL 2.0 and MIT
 Summary:        A simple non-validating CSS1 and HTML parser for C++
 Url:            http://htmlcxx.sourceforge.net/
@@ -25,7 +25,6 @@ developing applications that use htmlcxx.
 
 %prep
 %setup -q
-%configure --disable-static --enable-shared
 
 # convert to utf8 due rpmlint warning W: file-not-utf8 /usr/share/doc/htmlcxx/AUTHORS
 # convert to utf8 due rpmlint warning W: file-not-utf8 /usr/share/doc/htmlcxx/README
@@ -33,6 +32,10 @@ iconv -f iso8859-1 -t utf-8 AUTHORS > AUTHORS.conv && mv -f AUTHORS.conv AUTHORS
 iconv -f iso8859-1 -t utf-8 README > README.conv && mv -f README.conv README
 
 %build
+CC="$CC -std=gnu89"
+export CXXFLAGS="-std=c++14 $RPM_OPT_FLAGS"
+%configure --disable-static --enable-shared
+
 make %{?_smp_mflags}
 
 %install
@@ -60,5 +63,8 @@ make check
 %{_libdir}/pkgconfig/%{name}.pc
 
 %changelog
+* Tue Aug 15 2023 leeffo <liweiganga@uniontech.com> - 0.86-2
+- fix compile fail
+
 * Mon Jul 25 2022 loong_C <loong_c@yeah.net> - 0.86-1
 - init package