Fix building without wayland

Currently, due broken dependency generation, wayland support is
hardcoded in Makefile. We have to run dependency generation and auto
generation at every `make` call.

Additionally, function prototypes are now generated by python3 and its
clang module during build - added buildrequires for it.

vim.spec

@@ -122,6 +122,10 @@ BuildRequires: make
 # screen handling library
 BuildRequires: ncurses-devel
 
+# for building function prototypes
+BuildRequires: python3
+BuildRequires: python3-clang
+
 # for python plugin
 BuildRequires: python3-devel
 
@@ -444,6 +448,15 @@ perl -pi -e "s/vimrc/virc/"  os_unix.h
   --enable-year2038 \
   --disable-libsodium
 
+# related to the previous issue with `make depend`, auto/osdef.h
+# has to be generated
+make auto/osdef.h
+# wayland is hardwired in Makefile dependencies
+# to work around it call `make depend` before build
+# problem fixed by https://github.com/vim/vim/pull/18538
+# remove once it is merged
+make depend
+
 %make_build
 cp vim minimal-vim
 make clean
@@ -503,6 +516,15 @@ mv -f os_unix.h.save os_unix.h
   --enable-year2038 \
   --disable-canberra
 
+## related to the previous issue with `make depend`, auto/osdef.h
+## has to be generated
+make auto/osdef.h
+# wayland is hardwired in Makefile dependencies
+# to work around it call `make depend` before build
+# problem fixed by https://github.com/vim/vim/pull/18538
+# remove once it is merged
+make depend
+
 %make_build
 cp vim enhanced-vim
 
@@ -566,6 +588,15 @@ cp vim enhanced-vim
   --enable-socketserver \
   --enable-canberra
 
+# related to the issue with `make depend`, auto/osdef.h
+# has to be generated
+make auto/osdef.h auto/gui_gtk_gresources.h auto/wayland/wlr-data-control-unstable-v1.h
+# wayland is hardwired in Makefile dependencies
+# to work around it call `make depend` before build
+# problem fixed by https://github.com/vim/vim/pull/18538
+# remove once it is merged
+make depend
+
 %make_build
 cp vim gvim
 make clean
@@ -581,6 +612,9 @@ cp -f %{SOURCE7} %{buildroot}/%{_datadir}/%{name}/vimfiles/template.spec
 rm -f README*.info
 
 cd src
+# related to the issue with `make depend`, auto/osdef.h
+# has to be generated
+make auto/osdef.h auto/gui_gtk_gresources.h auto/wayland/wlr-data-control-unstable-v1.h
 # Adding STRIP=/bin/true, because Vim wants to strip the binaries by himself
 # and put the stripped files into correct dirs. Build system (koji/brew) 
 # does it for us, so there is no need to do it in Vim