Remove a file that was accidentally committed

stdspecialchars.inc was unintentionally committed (it is still a
work in progress) at 2dff14d2. This commit also reverts 7c4a1e16 (it
is now unneeded). For details, see:
https://www.mail-archive.com/search?l=mid&q=CAE_dPV4OpkEFbHuu1daTrUij298%3DfiNQs_4u_tz98MjynAyXEg%40mail.gmail.com

lib/Makefile.am

@@ -2124,7 +2124,6 @@ dist_layouts_DATA =\
 	layouts/stdlyxlist.inc \
 	layouts/stdrefprefix.inc \
 	layouts/stdsections.inc \
-	layouts/stdspecialchars.inc \
 	layouts/stdstarsections.inc \
 	layouts/stdstruct.inc \
 	layouts/stdtitle.inc \

lib/layouts/stdspecialchars.inc

@@ -1,78 +0,0 @@
-#
-# Standard special characters
-#
-
-Format 58
-SpecialChar LigatureBreak
-	Type		Formatting
-	LabelString	"Ligature Break|k"
-	LyXOutput	0x007c
-	LatexOutput	\textcompwordmark{}
-	PlaintextOutput	0x200c
-	XHTMLOutput	‌
-	IsLetter	1
-End
-
-SpecialChar EndOfSentence
-	LabelString	"End of Sentence|E"
-	LyXOutput	0x002e
-	LatexOutput	\@.
-	PlaintextOutput	0x002e
-	DocBookOutput	"."
-	XHTMLOutput	"."
-End
-
-SpecialChar LDots
-	LabelString	"Ellipsis|i"
-	Width		"."
-	LyXOutput	0x2026
-	LatexOutput	\ldots{}
-	PlaintextOutput	0x2026
-	DocBookOutput	"..."
-	XHTMLOutput	…
-End
-
-SpecialChar MenuSeparator
-	LabelString	"Menu Separator|M"
-	Width		" x "
-	LyXOutput	0x25b7
-	LatexOutput	\lyxarrow{}
-	LaTexOutputRTL	\lyxarrow*{}
-	PlaintextOutput	"->"
-	DocBookOutput	&lyxarrow;
-	XHTMLOutput	⇒
-	Requires	lyxarrow
-End
-
-SpecialChar Hyphenation
-	Type		Formatting
-	LabelString	"Hyphenation Point|H"
-	LyXOutput	0x2010
-	LatexOutput	\-
-	IsLetter	1
-End
-
-SpecialChar Slash
-	LabelString	"Breakable Slash|a"
-	LyXOutput	0x002f
-	LatexOutput	\slash{}
-	PlaintextOutput	0x002f
-	DocBookOutput	/
-	XHTMLOutput	⁄
-End
-
-SpecialChar NobreakDash
-	LabelString	"Protected Hyphen|y"
-	LyXOutput	0x2010
-	LatexOutput	\nobreakdash-
-	NeedsProtect	1
-	PlaintextOutput	0x2011
-	DocBookOutput	-
-	XHTMLOutput	‑
-	Requires	amsmath
-	IsLetter	1
-	Font
-	  Color		latex
-	EndFont
-End
-