build: Use PACKAGE_URL variable

[rbuj]

Test:

$ grep PACKAGE_URL config.h
#define PACKAGE_URL "https://mate-desktop.org"
$ grep homepage mate-terminal.appdata.xml
  <url type="homepage">https://mate-desktop.org</url>

• Use bottom-up pattern instead of up-down for replacing the suffix at the end of file names as follows (Makefile.am):

usage:

$(var:suffix=replacement)

before:

appdata_in_files = mate-terminal.appdata.xml.in
appdata_DATA = $(appdata_in_files:.xml.in=.xml)

after:

appdata_DATA = mate-terminal.appdata.xml
appdata_in_files = $(appdata_DATA:.xml=.xml.in)
appdata_in_in_files = $(appdata_in_files:.xml.in=.xml.in.in)

[raveit65]

You did more as mentioned in commit message.

[rbuj]

@raveit65 done

[rbuj]

I also updated the meson.build file. The MATE components that currently support meson build are:

• marco
• mate-backgrounds
• mate-desktop
• mate-terminal
• mozo