treewide: Per RFC45, remove all unquoted URLs

pkgs/data/documentation/bgnet/default.nix

@@ -5,7 +5,7 @@ stdenv.mkDerivation {
   version = "3.0.21";
 
   src = fetchurl {
-    url = https://beej.us/guide/bgnet/bgnet.tgz;
+    url = "https://beej.us/guide/bgnet/bgnet.tgz";
     sha256 = "00ggr5prc5i3w9gaaw2sadfq6haq7lmh0vdilaxx8xz9z5znxvyv";
   };
 
@@ -24,7 +24,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Beej’s Guide to Network Programming";
-    homepage = https://beej.us/guide/bgnet/;
+    homepage = "https://beej.us/guide/bgnet/";
     license = lib.licenses.unfree;
 
     maintainers = with lib.maintainers; [ Profpatsch ];

pkgs/data/documentation/man-pages-posix/default.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "POSIX man-pages (0p, 1p, 3p)";
-    homepage = https://www.kernel.org/doc/man-pages/;
+    homepage = "https://www.kernel.org/doc/man-pages/";
     platforms = stdenv.lib.platforms.unix;
   };
 }

pkgs/data/documentation/man-pages/default.nix

@@ -19,8 +19,8 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Linux development manual pages";
-    homepage = https://www.kernel.org/doc/man-pages/;
-    repositories.git = http://git.kernel.org/pub/scm/docs/man-pages/man-pages;
+    homepage = "https://www.kernel.org/doc/man-pages/";
+    repositories.git = "http://git.kernel.org/pub/scm/docs/man-pages/man-pages";
     license = licenses.gpl2Plus;
     platforms = with platforms; unix;
     priority = 30; # if a package comes with its own man page, prefer it

pkgs/data/documentation/mustache-spec/default.nix

@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
       For a list of implementations and tips, see ${homepage}.
     '';
 
-    homepage = http://mustache.github.io/;
+    homepage = "http://mustache.github.io/";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ Profpatsch ];
     platforms = lib.platforms.all;

pkgs/data/documentation/rnrs/common.nix

@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
       Algorithmic Language Scheme.
     '';
 
-    homepage = http://swiss.csail.mit.edu/~jaffer/Scheme;
+    homepage = "http://swiss.csail.mit.edu/~jaffer/Scheme";
 
     broken = true;
   };

pkgs/data/documentation/std-man-pages/default.nix

@@ -4,7 +4,7 @@ stdenv.mkDerivation {
   name = "std-man-pages-4.4.0";
 
   src = fetchurl {
-    url = mirror://gcc/libstdc++/doxygen/libstdc++-man.4.4.0.tar.bz2;
+    url = "mirror://gcc/libstdc++/doxygen/libstdc++-man.4.4.0.tar.bz2";
     sha256 = "0153py77ll759jacq41dp2z2ksr08pdcfic0rwjd6pr84dk89y9v";
   };
 

pkgs/data/documentation/stdman/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
       files from cppreference and generates groff-formatted manual
       pages for Unix-based systems. The goal is to provide excellent
       formatting for easy readability.";
-    homepage = https://github.com/jeaye/stdman;
+    homepage = "https://github.com/jeaye/stdman";
     license = licenses.mit;
     platforms = platforms.unix;
     maintainers = [ maintainers.twey ];

pkgs/data/documentation/zeal/default.nix

@@ -32,7 +32,7 @@ mkDerivation rec {
       Zeal is a simple offline API documentation browser inspired by Dash (macOS
       app), available for Linux and Windows.
     '';
-    homepage    = https://zealdocs.org/;
+    homepage    = "https://zealdocs.org/";
     license     = licenses.gpl3;
     maintainers = with maintainers; [ skeidel peterhoeg ];
     platforms   = platforms.linux;