* i686.din: Remove _strtold.
* x86_64.din: Move strtold definition...
* common.din: ...to here.
* include/cygwin/version.h: Bump api minor number to reflect previous change.
	* gdb.dwarf2/implptrconst.exp: Create a CU with 4 byte address
	size and change type sizes to 4 bytes.