gnu: zig: Respect the PKG_CONFIG environment variable.

* gnu/packages/patches/zig-0.9-build-respect-PKG_CONFIG-env-var.patch:
New file.
* gnu/packages/patches/zig-0.10-build-respect-PKG_CONFIG-env-var.patch:
New file.
* gnu/packages/patches/zig-0.11-build-respect-PKG_CONFIG-env-var.patch:
New file.
* gnu/packages/patches/zig-0.12-build-respect-PKG_CONFIG-env-var.patch:
New file.
* gnu/packages/patches/zig-0.13-build-respect-PKG_CONFIG-env-var.patch:
New file.
* gnu/local.mk (dist_patch_DATA): Register them.
* gnu/packages/zig.scm (zig-0.9,zig-0.10,zig-0.11,zig-0.12,zig-0.13)[source]:
Add patches.
* guix/build/zig-build-system.scm (configure): set PKG_CONFIG.

Change-Id: I0abf871c6990144fc472191bf1167aa2fc765161
Modified-by: Hilton Chain <hako@ultrarare.space>
Signed-off-by: Hilton Chain <hako@ultrarare.space>

gnu: Add zig-0.13.

* gnu/packages/patches/zig-0.13-fix-runpath.patch: New file.
* gnu/local.mk (dist_patch_DATA): Regisiter it.
* gnu/packages/zig.scm (zig-0.13-glibc-abi-tool,zig-0.13): New variables.

Change-Id: I217a1d444acb600d8cc38abcaa3950156b11cbae

gnu: Add zig-0.12.0-109.

* gnu/packages/zig.scm (zig-0.12.0-109): New variable.

Change-Id: If480110b20b2971fe7562bbd60fcb74afc5c1ed4

gnu: ncdu: Update to 2.6.

* gnu/packages/ncdu.scm (ncdu): Update to 2.6.
[source]: Adjust snippet to not remove manpage.
[arguments]: Remove adjustments to phases.
[inputs]: Add zstd:lib.
[native-inputs]: Add pkg-config.
Remove perl.

Change-Id: I6e85f06f22dcd5d62b41009039b984e6b8e65b28

gnu: Add zig-0.12.

* gnu/packages/patches/zig-0.12-fix-runpath.patch: New file.
* gnu/packages/patches/zig-0.12-use-baseline-cpu-by-default.patch: New file.
* gnu/packages/patches/zig-0.12-use-system-paths.patch: New file.
* gnu/local.mk (dist_patch_DATA): Regisiter them.
* gnu/packages/zig.scm (zig-0.12-glibc-abi-tool,zig-0.12): New variables.

Change-Id: I700d0afa2b373bf24a4f3527548e86dbed1aff17

gnu: Add zig-0.11.0-3604.

* gnu/packages/zig.scm (zig-0.11.0-3604): New variable.

Change-Id: I4d419344197d8ae4a44a6267a7594c11a5687377

gnu: Add zig-0.11.0-3506.

* gnu/packages/zig.scm (zig-0.11.0-3506): New variable.

Change-Id: Ia1edd0d1e54f8a05b2b1d74986c259342e64a89c

gnu: Add zig-0.11.0-3503.

* gnu/packages/zig.scm (zig-0.11.0-3503): New variable.

Change-Id: I8300bda579865a547bd45be31b74d8751ee16e63

gnu: Add zig-0.11.0-3501.

* gnu/packages/zig.scm (zig-0.11.0-3501): New variable.

Change-Id: Ia487a9e08bcb12169becf5b834cb9c14088f5f18

gnu: Add zig-0.11.0-3344.

* gnu/packages/zig.scm (zig-0.11.0-3344): New variable.

Change-Id: Id3b4425bb5018df6e7ec58f82a8b654ba073a487

gnu: Add zig-0.11.0-3245.

* gnu/packages/zig.scm (zig-0.11.0-3245): New variable.

Change-Id: Ie7cc13a4e3db496ff771e182a7b89248f1352983

gnu: Add zig-0.11.0-1967.

* gnu/packages/zig.scm (zig-0.11.0-1967): New variable.

Change-Id: I198cdb0a1e237e573360f7c37feff9bac5e4e3f2

gnu: Add zig-0.11.0-761.

* gnu/packages/zig.scm (zig-0.11.0-761): New variable.

Change-Id: Ia2ce5d7c699fa492cac0d1c13f9b080a5657457a

gnu: Add zig-0.11.0-702.

* gnu/packages/zig.scm (zig-0.11.0-702): New variable.

Change-Id: Ic532f9d590b8804c8f0dedbeec45f7b244372b28

gnu: Add zig-0.11.0-638.

* gnu/packages/zig.scm (zig-0.11.0-638): New variable.

Change-Id: I5012ae588d93a7ecf646686719b54e05f3c94f95

gnu: Add zig-0.11.0-631.

* gnu/packages/zig.scm (zig-0.11.0-631): New variable.

Change-Id: I7acbcd4a34c68eb9c3cce4fb4ec48a858b912f55

gnu: Add zig-0.11.0-587.

* gnu/packages/zig.scm (zig-0.11.0-587): New variable.

Change-Id: Ie15ecff5647e658ced1e2d0888ba90986296ffa2

gnu: Add zig-0.11.0-494.

* gnu/packages/zig.scm (zig-0.11.0-494): New variable.

Change-Id: I4b41f283168f70af08f1a3e3fa88804fee64280f

gnu: Add zig-0.11.0-384.

* gnu/packages/zig.scm (zig-0.11.0-384): New variable.

Change-Id: I9b8388600e51840df0de19e9367f45e2f386d9f4

gnu: Add zig-0.11.0-149.

* gnu/packages/zig.scm (zig-0.11.0-149): New variable.

Change-Id: Ibb5b0df17b20e161772d846f589c06d3fc811263