win32: Use https for installer downloads

Fixes #1268

win32/installer/hexchat.iss.tt

@@ -259,18 +259,18 @@ begin
 	begin
 
 #if APPARCH == "x64"
-		REDIST := 'http://dl.hexchat.net/misc/vcredist_2013_x64.exe';
-		PERL := 'http://dl.hexchat.net/misc/perl/Perl%205.20.0%20x64.msi';
+		REDIST := 'https://dl.hexchat.net/misc/vcredist_2013_x64.exe';
+		PERL := 'https://dl.hexchat.net/misc/perl/Perl%205.20.0%20x64.msi';
 		PY2 := 'http://python.org/ftp/python/2.7.8/python-2.7.8.amd64.msi';
 		PY3 := 'http://python.org/ftp/python/3.4.1/python-3.4.1.amd64.msi';
 #else
-		REDIST := 'http://dl.hexchat.net/misc/vcredist_2013_x86.exe';
-		PERL := 'http://dl.hexchat.net/misc/perl/Perl%205.20.0%20x86.msi';
+		REDIST := 'https://dl.hexchat.net/misc/vcredist_2013_x86.exe';
+		PERL := 'https://dl.hexchat.net/misc/perl/Perl%205.20.0%20x86.msi';
 		PY2 := 'http://python.org/ftp/python/2.7.8/python-2.7.8.msi';
 		PY3 := 'http://python.org/ftp/python/3.4.1/python-3.4.1.msi';
 #endif
-		DOTNET := 'http://dl.hexchat.net/misc/dotnet_40.exe';
-		SPELL := 'http://dl.hexchat.net/hexchat/HexChat%20Spelling%20Dictionaries%20r2.exe';
+		DOTNET := 'https://dl.hexchat.net/misc/dotnet_40.exe';
+		SPELL := 'https://dl.hexchat.net/hexchat/HexChat%20Spelling%20Dictionaries%20r2.exe';
 
 		if not CheckVCInstall() then
 			idpAddFile(REDIST, ExpandConstant('{tmp}\vcredist.exe'));