Fix mixup between Requires and BuildRequires (#2084297)

R are now in the same form as BR.

PyMca.spec

@@ -26,12 +26,12 @@ BuildRequires:  desktop-file-utils
 BuildRequires:  ImageMagick
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
-BuildRequires:  %py3_dist cython
-BuildRequires:  %py3_dist numpy
-BuildRequires:  %py3_dist h5py
-BuildRequires:  %py3_dist pyqt5
-BuildRequires:  %py3_dist fisx
-BuildRequires:  %py3_dist matplotlib
+BuildRequires:  python3dist(cython)
+BuildRequires:  python3dist(numpy)
+BuildRequires:  python3dist(h5py)
+BuildRequires:  python3dist(pyqt5)
+BuildRequires:  python3dist(fisx)
+BuildRequires:  python3dist(matplotlib)
 BuildRequires:  python3-matplotlib-qt5
 BuildRequires:  mesa-libGL-devel
 BuildRequires:  mesa-libGLU-devel
@@ -39,6 +39,10 @@ BuildRequires:  qhull-devel
 BuildRequires:  glibc-langpack-pl
 Requires:       hicolor-icon-theme
 Requires:       %{name}-data = %{version}-%{release}
+# Dependency on the graphical toolkit is not autogenerated because many different
+# ones are supported, https://bugzilla.redhat.com/show_bug.cgi?id=2084297.
+Requires:       python3dist(pyqt5)
+Requires:       python3-matplotlib-qt5
 
 %description
 PyMCA provides a graphical interface for multi-channel analyzer spectra