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This file contains hand-coded assembler implementations of the filter functions for 32-bit Arm platforms. These are only used when the compiler doesn't support neon intrinsics (added to GCC 4.3 in 2008) or is exactly GCC 4.5.4 (released 2012), both of which are sufficiently unlikely to be true that it's fair to say the assembler is no longer used. This commit deletes filter_neon.S and removes the now obsolete preprocessor logic in pngpriv.h. Signed-off-by: Bill Roberts <bill.roberts@arm.com> Signed-off-by: Cosmin Truta <ctruta@gmail.com>