Correct placement of namespace declarations.

With the current placement the definition of make_unique is not in the std namespace as intended but in the namespace OpenViBE::AcquisitionServer::std which is wrong. This patch corrects that. Tested on Fedora 35,36 and 37.

contrib/plugins/server-drivers/eemagine-eego/src/ovasCDriverEEGO.cpp

@@ -28,11 +28,6 @@
 #endif
 #include <eemagine/sdk/factory.h> // Where it all starts
 
-// Namespaces
-namespace OpenViBE {
-namespace AcquisitionServer {
-namespace es = eemagine::sdk;
-
 #if defined TARGET_OS_Linux || defined TARGET_OS_MacOS
 namespace std {
     template<class T> struct _Unique_if {
@@ -66,6 +61,11 @@ namespace std {
 }
 #endif
 
+// Namespaces
+namespace OpenViBE {
+namespace AcquisitionServer {
+namespace es = eemagine::sdk;
+
 //___________________________________________________________________//
 //                                                                   //