Fix build when directory not equals name

I tried building SailTuner from source in the SFOS SDK, but failed with:

+ qmake -qt=5 -makefile 'QMAKE_CFLAGS_RELEASE=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -march=armv8-a' 'QMAKE_CFLAGS_DEBUG=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -march=armv8-a' 'QMAKE_CXXFLAGS_RELEASE=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -march=armv8-a' 'QMAKE_CXXFLAGS_DEBUG=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -march=armv8-a' QMAKE_STRIP=: PREFIX=/usr LIBDIR=/usr/lib64
Usage: /usr/lib64/qt5/bin/qmake [mode] [options] [files]

... (rest of qmake syntax)

error: Bad exit status from /var/tmp/rpm-tmp.7GBOd3 (%build)

RPM build errors:
    Macro expanded in comment on line 66: %{_datadir}/%{name}

    Bad exit status from /var/tmp/rpm-tmp.7GBOd3 (%build)

This change allowed qmake to actually perform build. I found afterwards
that it also works when directory in which qmake is run is
'harbour-sailtuner', but since I ran git clone, I ended up with
SailTuner dir name.

rpm/harbour-sailtuner.spec

@@ -40,7 +40,7 @@ Instrumental multi-temperament chromatic tuner
 # >> build pre
 # << build pre
 
-%qtc_qmake5 
+%qtc_qmake5 %{name}.pro
 
 %qtc_make %{?_smp_mflags}