PR modula2/112921 missing modules shortreal shortstr shortconv convstringshort

PR modula2/112921 missing modules shortreal shortstr shortconv convstringshort

For completeness here are three SHORTREAL modules which match their
LONGREAL and REAL counterparts.  The datatype SHORTREAL is a GNU
extension and these modules were missing.

gcc/m2/ChangeLog:

	PR modula2/112921
	* gm2-libs-iso/ConvStringShort.def: New file.
	* gm2-libs-iso/ConvStringShort.mod: New file.
	* gm2-libs-iso/ShortConv.def: New file.
	* gm2-libs-iso/ShortConv.mod: New file.
	* gm2-libs-iso/ShortMath.def: New file.
	* gm2-libs-iso/ShortMath.mod: New file.
	* gm2-libs-iso/ShortStr.def: New file.
	* gm2-libs-iso/ShortStr.mod: New file.

libgm2/ChangeLog:

	PR modula2/112921
	* libm2iso/Makefile.am (M2DEFS): Add ConvStringShort.def,
	ShortConv.def, ShortMath.def and ShortStr.def.
	(M2MODS): Add ConvStringShort.mod,
	ShortConv.mod, ShortMath.mod and ShortStr.mod.
	* libm2iso/Makefile.in: Regenerate.

gcc/testsuite/ChangeLog:

	PR modula2/112921
	* gm2/iso/run/pass/shorttest.mod: New test.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>