gnu: Replace hard-coded "CC=gcc" with CC-FOR-TARGET calls.

* gnu/packages/admin.scm (cbatticon)[arguments]<#:make-flags>: Use
CC-FOR-TARGET.
* gnu/packages/assembly.scm (dev86)[arguments]<#:make-flags>: Likewise.
* gnu/packages/cdrom.scm (cd-discid)[arguments]<#:make-flags>: Likewise.
* gnu/packages/crypto.scm (signify, keyutils, ssss, libscrypt, enchive)
[arguments]<#:make-flags>: Likewise.
* gnu/packages/emacs-xyz.scm (emacs-emacsql, emacs-telega)[arguments]
<#:phases>: Likewise.
* gnu/packages/gnupg.scm (pgpdump)[arguments]<#:make-flags>: Likewise.
* gnu/packages/image-viewers.scm (feh, imv)[arguments]<#:make-flags>:
Likewise.
* gnu/packages/image.scm (libjxr, giflib, freeimage)[arguments]
<#:make-flags>: Likewise.
* gnu/packages/irc.scm (ii, sic)[arguments]<#:make-flags>: Likewise.
* gnu/packages/lua.scm (make-lua-expat, make-lua-ossl, make-lua-sec)
(make-lua-cqueues, make-lua-lgi, lua-resty-signal)[arguments]
<#:make-flags>: Likewise.
* gnu/packages/networking.scm (httping, pixiewps, sslh, nethogs, spiped)
(can-utils, hcxtools, batctl)[arguments]<#:make-flags>: Likewise.
* gnu/packages/pdf.scm (fbida)[arguments]<#:make-flags>: Likewise.
* gnu/packages/ssh.scm (endlessh)[arguments]<#:make-flags>: Likewise.
* gnu/packages/toys.scm (nyancat)[arguments]<#:make-flags>: Likewise.
* gnu/packages/upnp.scm (miniupnpc)[arguments]<#:make-flags>: Likewise.
* gnu/packages/xdisorg.scm (bemenu, xbanish, sxhkd, xcape, xssproxy)
(xrandr-invert-colors, hsetroot, xsettingsd)[arguments]<#:make-flags>:
Likewise.

Signed-off-by: Tobias Geerinckx-Rice <me@tobias.gr>

gnu/packages/lua.scm

@@ -215,7 +215,7 @@ some projects.")))
      `(#:make-flags
        (let ((out (assoc-ref %outputs "out"))
              (lua-version ,(version-major+minor (package-version lua))))
-         (list "CC=gcc"
+         (list ,(string-append "CC=" (cc-for-target))
                (string-append "LUA_LDIR=" out "/share/lua/" lua-version)
                (string-append "LUA_CDIR=" out "/lib/lua/" lua-version)))
        #:phases
@@ -356,7 +356,7 @@ directory structure and file attributes.")
      `(#:make-flags
        (let ((out (assoc-ref %outputs "out"))
              (lua-api-version ,(version-major+minor (package-version lua))))
-         (list "CC=gcc"
+         (list ,(string-append "CC=" (cc-for-target))
                "CFLAGS='-D HAVE_SYS_SYSCTL_H=0'" ; sys/sysctl.h is deprecated
                (string-append "prefix=" out)
                (string-append "LUA_APIS=" lua-api-version)))
@@ -417,7 +417,7 @@ binds OpenSSL's bignum, message digest, HMAC, cipher, and CSPRNG interfaces.")
        (let ((out (assoc-ref %outputs "out"))
              (lua-version ,(version-major+minor (package-version lua))))
          (list "linux"
-               "CC=gcc"
+               ,(string-append "CC=" (cc-for-target))
                "LD=gcc"
                (string-append "LUAPATH=" out "/share/lua/" lua-version)
                (string-append "LUACPATH=" out "/lib/lua/" lua-version)))
@@ -465,7 +465,7 @@ secure session between the peers.")
        #:make-flags
        (let ((out (assoc-ref %outputs "out"))
              (lua-api-version ,(version-major+minor (package-version lua))))
-         (list "CC=gcc"
+         (list ,(string-append "CC=" (cc-for-target))
                (string-append "LUA_APIS=" lua-api-version)))
        #:phases
        (modify-phases %standard-phases
@@ -657,7 +657,7 @@ describing the commented declarations and functions.")
     (build-system gnu-build-system)
     (arguments
      `(#:make-flags
-       (list "CC=gcc"
+       (list ,(string-append "CC=" (cc-for-target))
              (string-append "PREFIX=" (assoc-ref %outputs "out")))
        #:phases
        (modify-phases %standard-phases
@@ -1014,7 +1014,7 @@ on numbers.")
     (build-system gnu-build-system)
     (arguments
      `(#:tests? #f ;TODO: Run the test suite.
-       #:make-flags (list "CC=gcc"
+       #:make-flags (list ,(string-append "CC=" (cc-for-target))
                           (string-append "PREFIX=" %output))
        #:phases
        (modify-phases %standard-phases