GccToolChain: whitelist all -f* and -O* gcc options

there are way too many -f* options to catch all relevant ones.
my particular case was the linux kernel, for which passing
-mcmodel=kernel but not -fno-PIE caused a gcc error.
if any particular option causes trouble, it should be blacklisted
instead.

also handle -O* while at it; -Og comes to mind as a relevant one.

this follows 3b79fafb3 in spirit.

Change-Id: I5de56082b695205409a8e82de2cab0618e2806a8
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangcodemodel/test/data/completion/completion.pro

@@ -27,7 +27,7 @@ SOURCES = \
     privateFuncDefCompletion.cpp \
     signalCompletion.cpp
 
-QMAKE_CXXFLAGS += -ffoo
+QMAKE_CXXFLAGS += -broken
 
 HEADERS = mainwindow.h
 FORMS = mainwindow.ui

src/plugins/clangcodemodel/test/data/find-usages/find-usages.pro

@@ -2,4 +2,4 @@ TEMPLATE = app
 QT = core
 HEADERS = defs.h
 SOURCES = main.cpp
-QMAKE_CXXFLAGS += -ffoo
+QMAKE_CXXFLAGS += -broken

src/plugins/clangcodemodel/test/data/follow-symbol/follow-symbol.pro

@@ -2,4 +2,4 @@ TEMPLATE = app
 CONFIG -= qt
 HEADERS = cursor.h header.h
 SOURCES = cursor.cpp main.cpp
-QMAKE_CXXFLAGS += -ffoo
+QMAKE_CXXFLAGS += -broken

src/plugins/clangcodemodel/test/data/highlighting/highlighting.pro

@@ -1,4 +1,4 @@
 TEMPLATE = app
 CONFIG -= qt
 SOURCES = highlighting.cpp
-QMAKE_CXXFLAGS += -ffoo
+QMAKE_CXXFLAGS += -broken

src/plugins/clangcodemodel/test/data/local-references/local-references.pro

@@ -1,4 +1,4 @@
 TEMPLATE = app
 CONFIG -= qt
 SOURCES = references.cpp
-QMAKE_CXXFLAGS += -ffoo
+QMAKE_CXXFLAGS += -broken