sci-visualization/gnuplot: Fix unbalanced braces in C source

Closes: https://bugs.gentoo.org/915492
Signed-off-by: Ulrich Müller <ulm@gentoo.org>

sci-visualization/gnuplot/files/gnuplot-5.4.9-unbal-braces.patch

@@ -0,0 +1,31 @@
+https://bugs.gentoo.org/915492
+Patch from upstream branch-5-4-stable branch
+
+commit b5b668ca442e0d7399e2b432fe5fe5fb4c48a1a2
+Author: Peter Korsgaard <peter@korsgaard.com>
+Date:   Sun Oct 1 10:20:31 2023 +0200
+
+    term/post.trm: unbreak !HAVE_DEFLATE_ENCODER builds
+
+--- a/term/post.trm
++++ b/term/post.trm
+@@ -4000,17 +4000,16 @@ PS_image (unsigned int M, unsigned int N, coordval *image, gpiPoint *corner, t_i
+ 	cscale = 1.0;
+ 
+ #ifdef HAVE_DEFLATE_ENCODER
+-    if (ps_params->level3) {
++    if (ps_params->level3)
+ 	encoded_image = (void *)PS_encode_png_image(M, N, image, color_mode,
+ 					    bits_per_component, max_colors, cscale,
+ 					    &num_encoded_bytes);
+-    } else {
++    else
+ #endif
+ 	encoded_image = PS_encode_image(M, N, image, color_mode,
+ 					bits_per_component, max_colors, cscale,
+ 					(ps_params->level1 ? PS_ASCII_HEX : PS_ASCII85),
+ 					&num_encoded_bytes);
+-    }
+ 
+ 
+     fputs("%%%%BeginImage\n", gppsfile);

sci-visualization/gnuplot/gnuplot-5.4.9.ebuild

@@ -80,6 +80,7 @@ TEXMF="${EPREFIX}/usr/share/texmf-site"
 
 PATCHES=(
 	"${FILESDIR}"/${PN}-5.0.6-no-picins.patch
+	"${FILESDIR}"/${PN}-5.4.9-unbal-braces.patch
 )
 
 pkg_setup() {