Compiling: fix Mageia oneliner

Bash does not seem to like parsing several strings at once.

reference/compiling_for_x11.rst

@@ -39,8 +39,8 @@ Distro-specific oneliners
 +---------------+------------------------------------------------------------------------------------------------------------+
 | **Mageia**    | ::                                                                                                         |
 |               |                                                                                                            |
-|               |     urpmi scons pkgconfig "pkgconfig(alsa) pkgconfig(freetype2) pkgconfig(glu) pkgconfig(libpulse)" \      |
-|               |         "pkgconfig(openssl) pkgconfig(udev) pkgconfig(x11) pkgconfig(xcursor) pkgconfig(xinerama)" \       |
+|               |     urpmi scons pkgconfig "pkgconfig(alsa)" "pkgconfig(freetype2)" "pkgconfig(glu)" "pkgconfig(libpulse)" \|
+|               |         "pkgconfig(openssl)" "pkgconfig(udev)" "pkgconfig(x11)" "pkgconfig(xcursor)" "pkgconfig(xinerama)"\|
 |               |         "pkgconfig(xrandr)"                                                                                |
 +---------------+------------------------------------------------------------------------------------------------------------+
 | **Ubuntu**    | ::                                                                                                         |