Build fix for linux using Qt build tools. Corrects gcc version detection. Before patch some lines in g++ --vesrion output could be incorrectly recognized as version 4.6 and therefore keyword "override" would be declared as macro despite being known to compiler. This was leading to compile error. Should fix #8695.

Qt/Native.pro

@@ -7,7 +7,7 @@ CONFIG += staticlib
 include(Settings.pri)
 
 # To support Sailfish which is stuck on GCC 4.6
-linux-g++:system($$QMAKE_CXX --version | grep "4.6."): DEFINES+=override
+linux-g++:system($$QMAKE_CXX --version | grep \"4\.6\.\"): DEFINES+=override
 
 INCLUDEPATH += $$P/ext/native
 

Qt/PPSSPP.pro

@@ -10,7 +10,7 @@ else: LIBS += -lCore -lGPU -lCommon -lNative
 include(Settings.pri)
 
 # To support Sailfish which is stuck on GCC 4.6
-linux-g++:system($$QMAKE_CXX --version | grep "4.6."): DEFINES+=override
+linux-g++:system($$QMAKE_CXX --version | grep \"4\.6\.\"): DEFINES+=override
 
 lessThan(QT_MAJOR_VERSION, 5) {
 	macx: error(PPSSPP requires Qt5 for OS X but $$[QT_VERSION] was detected.)