Fix capitalisation of LICENCE.TXT

If InnoSetup is run on a case sensitive system then the configuration
files must match what the file is actually called.

release/tigervnc.iss.in

@@ -16,7 +16,7 @@ DefaultGroupName=TigerVNC 64-bit
 #else
 DefaultGroupName=TigerVNC
 #endif
-LicenseFile=@CMAKE_SOURCE_DIR@\LICENCE.txt
+LicenseFile=@CMAKE_SOURCE_DIR@\LICENCE.TXT
 
 [Files]
 Source: "@CMAKE_BINARY_DIR@\vncviewer\vncviewer.exe"; DestDir: "{app}"; Flags: ignoreversion restartreplace; 

release/winvnc.iss.in

@@ -16,7 +16,7 @@ DefaultGroupName=TigerVNC Server 64-bit
 #else
 DefaultGroupName=TigerVNC Server
 #endif
-LicenseFile=@CMAKE_SOURCE_DIR@\LICENCE.txt
+LicenseFile=@CMAKE_SOURCE_DIR@\LICENCE.TXT
 
 [Dirs]
 ; This directory is necessary to prevent the X509 file chooser from causing