pmb/aportgen/gcc.py: add LANG_D=false (!1849)

Alpine's APKBUILD for gcc supports a new language that we don't need, so
disable it just like the irrelevant ones.

Related: https://gitlab.com/postmarketOS/pmaports/merge_requests/839

pmb/aportgen/gcc.py

@@ -62,6 +62,7 @@ def generate(args, pkgname):
 
     below_header = "CTARGET_ARCH=" + arch + """
         CTARGET="$(arch_to_hostspec ${CTARGET_ARCH})"
+        LANG_D=false
         LANG_OBJC=false
         LANG_JAVA=false
         LANG_GO=false

test/testdata/aportgen/pmaports/cross/gcc-armhf/APKBUILD

@@ -4,6 +4,7 @@
 
 CTARGET_ARCH=armhf
 CTARGET="$(arch_to_hostspec ${CTARGET_ARCH})"
+LANG_D=false
 LANG_OBJC=false
 LANG_JAVA=false
 LANG_GO=false