dev-scheme/gauche-gl: respect CFLAGS

Closes: https://bugs.gentoo.org/738818
Package-Manager: Portage-3.0.20, Repoman-3.0.3
Signed-off-by: Akinori Hattori <hattya@gentoo.org>

dev-scheme/gauche-gl/files/gauche-gl-0.6-cflags.patch

@@ -0,0 +1,11 @@
+--- a/src/Makefile.in
++++ b/src/Makefile.in
+@@ -17,7 +17,7 @@
+ # These are set by configure
+ # NB: cc and various flags must match the ones used to compile Gauche,
+ # so the make invocator shouldn't casually override them.
+-CFLAGS   = @DEFS@ @X_CFLAGS@ @GLUT_INCDIR@ @GLEW_INCDIR@
++CFLAGS   = @DEFS@ @CFLAGS@ @X_CFLAGS@ @GLUT_INCDIR@ @GLEW_INCDIR@
+ LDFLAGS  = @LDFLAGS@
+ OBJEXT   = @OBJEXT@
+ SOEXT    = @SOEXT@

dev-scheme/gauche-gl/gauche-gl-0.6.ebuild

@@ -27,6 +27,7 @@ S="${WORKDIR}/${MY_P}"
 
 PATCHES=(
 	"${FILESDIR}"/${P}-simple.viewer.patch
+	"${FILESDIR}"/${P}-cflags.patch
 	"${FILESDIR}"/${P}-cg.patch
 )