gnatmake, gnatprep, gprbuild: add page (#8557)

pages/common/gnatmake.md

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+# gnatmake
+
+> A low-level build tool for Ada programs (part of the GNAT toolchain).
+> More information: <https://gcc.gnu.org/onlinedocs/gnat_ugn/Building-with-gnatmake.html>.
+
+- Compile an executable:
+
+`gnatmake {{source_file1.adb source_file2.adb ...}}`
+
+- Set a custom executable name:
+
+`gnatmake -o {{executable_name}} {{source_file.adb}}`
+
+- [f]orce recompilation:
+
+`gnatmake -f {{source_file.adb}}`

pages/common/gnatprep.md

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+# 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}}`

pages/common/gprbuild.md

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+# gprbuild
+
+> A high-level build tool for projects written in Ada and other languages (C/C++/Fortran).
+> More information: <https://docs.adacore.com/gprbuild-docs/html/gprbuild_ug.html>.
+
+- Build a project (assuming only one `*.gpr` file exists in the current directory):
+
+`gprbuild`
+
+- Build a specific [P]roject file:
+
+`gprbuild -P{{project_name}}`
+
+- Clean up the build workspace:
+
+`gprclean`
+
+- Install compiled binaries:
+
+`gprinstall --prefix {{path/to/installation/dir}}`