bitcoin_qt.m4: Minor fixes, improve code orthogonality #11101
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The commit contains the following minor fixes.
. Only include '<QtCore/qconfig.h> for Qt5's QT_VERSION tests.
For Qt4, also include '<QtCore/qglobal.h> for the QT_VERSION tests.
This makes the tests work even if '-fPIC' or '-fPIE' is not used.
. Change quotes from incorrect double quotes to brackets in
'BITCOIN_QT_CONFIGURE'.
. Add some missing braces around variables in autoconf messages.
. Add a missing dollar sign in '_BITCOIN_QT_IS_STATIC'.
Additionally, the patch does the following.
. Add double qoutes to string tests where arguments could (theoretically)
contain spaces.
. Remove double quotes where not necessary.
. Consequently quote all arguments of M4 functions.
. Mark empty M4 arguments with '[]'.
. Other minor cosmetic fixes.