MapScript not closing font file handles and/or "include"d mapfiles

[pete@…]

When using PHP Mapscript to generate map tiles (using tile.php from the Ka-Map
project), file handles to TTF font files aren't being closed after the script is
finished.  The output of lsof shows:

/xxx/VeraBd.ttf
httpd     31401   apache  mem       REG      253,0      65932   18645269
/xxx/Vera.ttf
httpd     31439   apache  mem       REG      253,0      63684   18645272
/xxx/VeraIt.ttf
httpd     31439   apache  mem       REG      253,0      65932   18645269
/xxx/Vera.ttf

In addition, the same thing seems to happen when using the "INCLUDE" directive
inside a mapfile.  The included mapfiles aren't being closed:

In main mapfile:

INCLUDE "/xxx/subfile1.map"
INCLUDE "/xxx/subfile2.map"

Output of lsof:

httpd     31978   apache   60r      REG      253,0      85032    9389109
/xxx/subfile1.map
httpd     31978   apache   61r      REG      253,0       3580    9389098
/xxx/subfile2.map
httpd     31978   apache   62r      REG      253,0      85032    9389109
/xxx/subfile1.map
httpd     31978   apache   63r      REG      253,0       3580    9389098
/xxx/subfile2.map

As a result, continued requests to the script eventually exceed the system's
maximum number of open file handles and the requests begin to fail.

This doesn't occur when using the mapserv executable on the same mapfiles.