Build: hide USD symbols, make Blender symbols visible again

Following up to b555b8d.

Building Blender with hidden symbols but using libraries with visible symbols
was giving linker warnings, specifically for USD. So revert that for now, as
it was not needed for the bugfix.

Hide USD symbols (some of which are not in the USD namespace) to avoid potential
conflicts. May potentially help with AMD OpenCL issues in T74262.

source/creator/blender.map

@@ -58,12 +58,15 @@ local:
   opj_*;
   opus_*;
   *OSL*;
+  *pathYy*;
   png_*;
   *SDL*;
   *squish*;
   *tbb*;
+  *textFileFormatYy*;
   *TIFF*;
   *tinyformat*;
+  *usdBlender*;
   vorbis*;
   vp8*;
   vp9*;

source/creator/osx_locals.map

@@ -49,12 +49,15 @@ ogg*
 opj_*
 opus_*
 *OSL*
+*pathYy*
 png_*
 *SDL*
 *squish*
 *tbb*
+*textFileFormatYy*
 *TIFF*
 *tinyformat*
+*usdBlender*
 vorbis*
 vp8*
 vp9*