Capitalization, full-stops and unnecessary trailing \n fixes.

	* aout-adobe.c, * aout-cris.c, * i386linux.c, * m68klinux.c,
	* sparclinux.c, * coff-alpha.c, * coff-arm.c, * coff-mcore.c,
	* coffcode.h, * coffgen.c, * cofflink.c, * ecoff.c, * pe-mips.c,
	* peXXigen.c, * peicode.h: Standardize error/warning messages.