DOTCODE: fix not emitting FNC1 (signalling non-GS1) when input

just 2 digits
cmake: set `rpath` of CLI frontend on macOS install (ticket #346,
  props Hagen Röwer)
cmake: make uninstall: update to use `-E rm` if available, warn
  rather than fatal error if fail to remove, note if leaving
  "/zint" directory unremoved (i.e. "lib/cmake/zint")
library: de-duplicate errtxt no.
test suite: update BWIPP to latest
test suite: test_bwipp: enable & fix dotcode random test
test suite: fuzz: gen_corpora fuzz_data 1st -> 2nd

backend/tests/data/eps/dotcode_3.0_ds0.4.eps

@@ -1,40 +1,51 @@
 %!PS-Adobe-3.0 EPSF-3.0
-%%Creator: Zint 2.12.0.9
+%%Creator: Zint 2.16.0.9
 %%Title: Zint Generated Symbol
 %%Pages: 0
-%%BoundingBox: 0 0 66 48
+%%BoundingBox: 0 0 84 54
 %%EndComments
 /D { newpath 3 1 roll 0 360 arc fill } bind def
 /R { newpath 4 1 roll exch moveto 1 index 0 rlineto 0 exch rlineto neg 0 rlineto closepath fill } bind def
 /I { 2 copy } bind def
 1 1 1 setrgbcolor
-48 0 0 66 R
+54 0 0 84 R
 0 0 0 setrgbcolor
-45 1.2 I 3 D
+51 1.2 I 3 D
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-I 39 D
 I 51 D
-63 D
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-I 33 D
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-I 15 D
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+I 63 D
+75 D
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 I 21 D
 I 45 D
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+I 39 D
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+I 57 D
+69 D
+27 1.2 I 3 D
+I 39 D
+75 D
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+I 33 D
+I 45 D
+81 D
+15 1.2 I 27 D
+I 51 D
+I 63 D
+75 D
+9 1.2 I 9 D
+I 21 D
+I 33 D
+81 D
+3 1.2 I 3 D
+I 15 D
+I 27 D
+I 39 D
+I 63 D
+75 D