centralize and fixup example sources install targets

This follows suit with aeb036e in qtbase.

Change-Id: Ie8580d0a1f38ab9858b0e44c9f99bdc552a1752a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>

examples/multimedia/spectrum/3rdparty/fftreal/fftreal.pro

@@ -0,0 +1,44 @@
+include(../../spectrum.pri)
+
+static: error(This library cannot be built for static linkage)
+
+TEMPLATE = lib
+TARGET   = fftreal
+
+# FFTReal
+HEADERS  += Array.h \
+            Array.hpp \
+            DynArray.h \
+            DynArray.hpp \
+            FFTRealFixLen.h \
+            FFTRealFixLen.hpp \
+            FFTRealFixLenParam.h \
+            FFTRealPassDirect.h \
+            FFTRealPassDirect.hpp \
+            FFTRealPassInverse.h \
+            FFTRealPassInverse.hpp \
+            FFTRealSelect.h \
+            FFTRealSelect.hpp \
+            FFTRealUseTrigo.h \
+            FFTRealUseTrigo.hpp \
+            OscSinCos.h \
+            OscSinCos.hpp \
+            def.h
+	    
+# Wrapper used to export the required instantiation of the FFTRealFixLen template
+HEADERS  += fftreal_wrapper.h
+SOURCES  += fftreal_wrapper.cpp
+
+DEFINES  += FFTREAL_LIBRARY
+
+macx {
+    CONFIG += lib_bundle
+} else {
+    DESTDIR = ../..$${spectrum_build_dir}
+}
+
+EXAMPLE_FILES = bwins/fftreal.def eabi/fftreal.def readme.txt license.txt
+
+target.path = $$[QT_INSTALL_EXAMPLES]/multimedia/spectrum
+INSTALLS += target
+