Update cheatsheets

gnatprep

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gnatprep
+
+> Preprocessor for Ada source code files (part of the GNAT toolchain).
+> More information: <https://gcc.gnu.org/onlinedocs/gnat_ugn/Preprocessing-with-gnatprep.html>.
+
+- Use symbol definitions from a file:
+
+`gnatprep {{source_file}} {{target_file}} {{definitions_file}}`
+
+- Specify symbol values in the command-line:
+
+`gnatprep -D{{name}}={{value}} {{source_file}} {{target_file}}`