main/gcc: fix cross-compilation

main/gcc/APKBUILD

@@ -6,7 +6,7 @@ pkgver=6.4.0
 [ "$CHOST" != "$CTARGET" ] && _target="-$CTARGET_ARCH" || _target=""
 
 pkgname="$pkgname$_target"
-pkgrel=4
+pkgrel=5
 pkgdesc="The GNU Compiler Collection"
 url="http://gcc.gnu.org"
 arch="all"
@@ -138,7 +138,7 @@ fi
 if $LANG_ADA; then
 	subpackages="$subpackages libgnat::$CTARGET_ARCH gcc-gnat$_target:gnat"
 	_languages="$_languages,ada"
-	makedepends_build="$makedepends_build gcc-gnat$_cross"
+	makedepends_build="$makedepends_build gcc-gnat gcc-gnat$_cross"
 fi
 makedepends="$makedepends_build $makedepends_host"