pidgin/pidgin

Install our appdata file to $(datadir)/metainfo as that change was made a long time ago

This patch originates from Lars Wendler from Gentoo

https://gitweb.gentoo.org/repo/gentoo.git/commit/net-im/pidgin/files/pidgin-2.13.0-metainfo.patch?id=2dd6c1852251b5b67c3045badf173be9535b97a9

Testing Done:
Installed to a prefix and verified the file ended up in `$prefix/share/metainfo`

Reviewed at https://reviews.imfreedom.org/r/607/
/* XPM */
static char * arrow_right_xpm[] = {
"16 13 30 1",
" c None",
". c #5C3566",
"+ c #613A6A",
"@ c #BC9FBB",
"# c #623B6B",
"$ c #D5BDD2",
"% c #C0A5BF",
"& c #623C6C",
"* c #D4BCD1",
"= c #C0A5C0",
"- c #D3BBD1",
"; c #D5BED3",
"> c #C2A6C1",
", c #623C6B",
"' c #C3A2C0",
") c #C3A1BF",
"! c #C2A1BF",
"~ c #C19FBE",
"{ c #C2A0BE",
"] c #D2B9CF",
"^ c #A787A8",
"/ c #5E3667",
"( c #D3BBD0",
"_ c #D4BDD2",
": c #AE81A9",
"< c #C7A8C3",
"[ c #BB9FBB",
"} c #603A6A",
"| c #C7A7C3",
"1 c #BDA1BC",
" . ",
" .+ ",
" .@# ",
" .$%# ",
".........&$*=# ",
".-$$$$$$$$*;*>, ",
".$'))))))!~~{]^/",
".(_______*!:<[} ",
".........&*|@+ ",
" ._1+ ",
" .@+ ",
" .+ ",
" . "};