Add an option to disable the inclusion of the build date.

Debian has a goal to make reproducible builds therefore make it an
option instead of distro specific.
.
I added an "OR openSusE" to not "break" the old openSUSE behavior but ideally
they should just use -DDISABLE_BUILD_DATE=TRUE instead.
.
The old -DopenSUSE is not used for anything else so I removed it.

cmake/BuildParameters.cmake

@@ -21,6 +21,12 @@
 # Misc option
 #-------------------------------------------------------------------------------
 option(DISABLE_SVU "Disable superVU (don't use it)")
+option(DISABLE_BUILD_DATE "Disable including the binary compile date")
+
+if(DISABLE_BUILD_DATE OR openSUSE)
+    message(STATUS "Disabling the inclusion of the binary compile date.")
+    add_definitions(-DDISABLE_BUILD_DATE)
+endif()
 
 #-------------------------------------------------------------------------------
 # Graphical option

cmake/Pcsx2Utils.cmake

@@ -24,7 +24,6 @@ function(detectOperatingSystem)
                     message(STATUS "Build Fedora specific")
                 elseif("${OS_RELEASE}" MATCHES "^.*ID=.*suse.*$")
                     set(openSUSE TRUE PARENT_SCOPE)
-                    add_definitions(-DopenSUSE)
                     message(STATUS "Build openSUSE specific")
                 endif()
             endif()

pcsx2/System.cpp

@@ -196,7 +196,7 @@ void SysLogMachineCaps()
 	if ( !PCSX2_isReleaseVersion )
 	{
 		Console.WriteLn(Color_StrongGreen, "PCSX2 %u.%u.%u-%lld %s"
-#ifndef openSUSE
+#ifndef DISABLE_BUILD_DATE
 			"- compiled on " __DATE__
 #endif
 			, PCSX2_VersionHi, PCSX2_VersionMid, PCSX2_VersionLo,
@@ -205,7 +205,7 @@ void SysLogMachineCaps()
 	}
 	else { // shorter release version string
 		Console.WriteLn(Color_StrongGreen, "PCSX2 %u.%u.%u-%lld"
-#ifndef openSUSE
+#ifndef DISABLE_BUILD_DATE
 			"- compiled on " __DATE__
 #endif
 			, PCSX2_VersionHi, PCSX2_VersionMid, PCSX2_VersionLo,

pcsx2/gui/MainFrame.cpp

@@ -359,7 +359,7 @@ MainEmuFrame::MainEmuFrame(wxWindow* parent, const wxString& title)
 	else
 	{
 		// beta / development editions, which feature revision number and compile date.
-#ifndef openSUSE
+#ifndef DISABLE_BUILD_DATE
 		wintitle.Printf( L"%s  %d.%d.%d-%lld%s (git)  %s", pxGetAppName().c_str(), PCSX2_VersionHi, PCSX2_VersionMid, PCSX2_VersionLo,
 			SVN_REV, SVN_MODS ? L"m" : wxEmptyString, fromUTF8(__DATE__).c_str() );
 #else