don't allow an env var with invalid characters, also fixed a signedness warning

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24734 3ad0048d-3df7-0310-abae-a5850022a9f2
* always use 16-bit pushes for pushing/popping the segment registers on i8086 in Tcgx86.g_concatcopy

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24735 3ad0048d-3df7-0310-abae-a5850022a9f2
* support far references in second_cmp32bit for i8086

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24736 3ad0048d-3df7-0310-abae-a5850022a9f2
* support i8086 far references in tx86addnode.emit_op_right_left

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24737 3ad0048d-3df7-0310-abae-a5850022a9f2
removed unused var, cosmetics, no functional changes

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24738 3ad0048d-3df7-0310-abae-a5850022a9f2
merged fixes from MorphOS

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24739 3ad0048d-3df7-0310-abae-a5850022a9f2
 * Added fpmake.pp for building the ide

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24740 3ad0048d-3df7-0310-abae-a5850022a9f2