K 10
svn:author
V 7
zeising
K 8
svn:date
V 27
2019-08-15T14:43:50.931826Z
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svn:log
V 322
MFH: r508996

graphics/libGLw: Fix extern visibility

Import upstream patches to graphics/libGLw to fix extern visibility of some
symbols.  While here, also add a patch to fix a typo.
These patches pulls libGLw on par with upstream git master.

PR:		237917
Reported by:	Jason W. Bacon

Approved by:	ports-secteam (joneum)

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