dev-games/libnw: remove highly confusing sed to "respect CC"

But it's a generated automake Makefile.in, and the sed is removing every
line containing "CC = @CC@", so it's puzzling that anyone ever thought
to do this.

It was originally added in gentoo-historical-2:

  29 Jan 2009; Michael Sterrett <mr_bones_@gentoo.org> libnw-1.30.02.ebuild:
  EAPI=2; respect CC

And 15 years later it's the same (2003) tarball and the sed is decidedly
not needed (nor ever was).

Remove this bloaty junk.

Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
Signed-off-by: Sam James <sam@gentoo.org>

dev-games/libnw/libnw-1.30.02.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=7
 
-inherit autotools toolchain-funcs
+inherit autotools
 
 DESCRIPTION="Tools and libraries for NWN file manipulation"
 HOMEPAGE="https://sourceforge.net/projects/openknights"
@@ -23,19 +23,9 @@ DOCS=( AUTHORS ChangeLog NEWS README README.tech TODO )
 src_prepare() {
 	default
 	eautoreconf
-
-	local f
-	while IFS="" read -d $'\0' -r f; do
-		einfo "Removing hardcoded CC/CXX from ${f}"
-		sed -i \
-			-e '/^CC =/d' \
-			-e '/^CXX =/d' \
-			"${f}" || die
-	done < <(find "${S}" -name Makefile.in -type f -print0)
 }
 
 src_configure() {
-	tc-export CC CXX
 	econf --disable-static
 }