Update cheatsheets

gdc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gdc
+
+> D compiler using GCC as a backend.
+> More information: <https://wiki.dlang.org/Using_GDC>.
+
+- Create an executable:
+
+`gdc {{path/to/source.d}} -o {{path/to/output_executable}}`
+
+- Print information about module dependencies:
+
+`gdc -fdeps`
+
+- Generate Ddoc documentation:
+
+`gdc -fdoc`
+
+- Generate D interface files:
+
+`gdc -fintfc`
+
+- Do not link the standard GCC libraries in the compilation:
+
+`gdc -nostdlib`