C compatibility fixes

The tigervnc-xserver120.patch change is already upstream
(commit e4ec992984983ac9107efae1f1cc552007e4229e).

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

tigervnc-c99-1.patch

@@ -0,0 +1,30 @@
+Replace INITARGS with void
+
+Most compilers currently accept arbitrary identifiers in this place
+and ignore then, but this is going to change and turn into an error.
+
+Submitted upstream: <https://github.com/TigerVNC/tigervnc/pull/1698>
+
+
+diff --git a/unix/xserver/hw/vnc/vncModule.c b/unix/xserver/hw/vnc/vncModule.c
+index a448c2f1..fb8ce047 100644
+--- a/unix/xserver/hw/vnc/vncModule.c
++++ b/unix/xserver/hw/vnc/vncModule.c
+@@ -36,7 +36,7 @@
+ #include "XorgGlue.h"
+ #include "RandrGlue.h"
+ 
+-static void vncModuleInit(INITARGS);
++static void vncModuleInit(void);
+ 
+ static MODULESETUPPROTO(vncSetup);
+ 
+@@ -70,7 +70,7 @@ vncSetup(void * module, void * opts, int *errmaj, int *errmin) {
+     return (void *)1;
+ }
+ 
+-static void vncModuleInit(INITARGS)
++static void vncModuleInit(void)
+ {
+   static char once = 0;
+ 

tigervnc-c99-2.patch

@@ -0,0 +1,23 @@
+commit 25a03f430f47733b215eb9f0251e25ce7bdb7ada
+Author: Florian Weimer <fweimer@redhat.com>
+Date:   Wed Nov 22 12:57:03 2023 +0100
+
+    cmake: Use correct input pointer type for iconv detection
+    
+    The iconv function expects a char ** pointer argument for the input
+    pointer.  Future C compilers will flag this as an error (as it is not
+    valid C), causing this probe to fail incorrectly.
+
+diff --git a/cmake/Modules/FindIconv.cmake b/cmake/Modules/FindIconv.cmake
+index cf268ea0..9cd899da 100644
+--- a/cmake/Modules/FindIconv.cmake
++++ b/cmake/Modules/FindIconv.cmake
+@@ -36,7 +36,7 @@ IF(ICONV_FOUND)
+   #include <iconv.h>
+   int main(){
+     iconv_t conv = 0;
+-    const char* in = 0;
++    char* in = 0;
+     size_t ilen = 0;
+     char* out = 0;
+     size_t olen = 0;

tigervnc-xserver120.patch

@@ -67,7 +67,7 @@ index 5596e21..003fc3c 100644
  #include "globals.h"
 
 +#ifdef TIGERVNC
-+extern void vncExtensionInit(INITARGS);
++extern void vncExtensionInit(void);
 +#endif
 +
  /* List of built-in (statically linked) extensions */

tigervnc.spec

@@ -6,7 +6,7 @@
 
 Name:           tigervnc
 Version:        1.13.1
-Release:        6%{?dist}
+Release:        7%{?dist}
 Summary:        A TigerVNC remote display system
 
 %global _hardened_build 1
@@ -31,6 +31,9 @@ Patch1:         tigervnc-vncsession-restore-script-systemd-service.patch
 # This is tigervnc-%%{version}/unix/xserver116.patch rebased on the latest xorg
 Patch100:       tigervnc-xserver120.patch
 
+Patch101:       tigervnc-c99-1.patch
+Patch102:       tigervnc-c99-2.patch
+
 BuildRequires:  make
 BuildRequires:  gcc-c++
 BuildRequires:  gettext
@@ -196,6 +199,9 @@ sed -i -e '/add_subdirectory.*vnc/d' unix/CMakeLists.txt
 
 # Downstream patches
 
+%patch101 -p1 -b .c99-1
+%patch102 -p1 -b .c99-2
+
 %build
 %ifarch sparcv9 sparc64 s390 s390x
 export CFLAGS="$RPM_OPT_FLAGS -fPIC"
@@ -379,6 +385,9 @@ fi
 %{_datadir}/icons/hicolor/*/apps/*
 
 %changelog
+* Wed Nov 22 2023 Florian Weimer <fweimer@redhat.com> - 1.13.1-7
+- C compatibility fixes
+
 * Thu Nov 02 2023 Jan Grulich <jgrulich@redhat.com> - 1.13.1-6
 - Fix CVE-2023-5380 and CVE-2023-5367 (rebuild with fixed Xorg)