sci-geosciences/liblas: fix GCC 11 build

Closes: https://bugs.gentoo.org/789732
Signed-off-by: Sam James <sam@gentoo.org>

sci-geosciences/liblas/files/liblas-1.8.1-gcc11.patch

@@ -0,0 +1,34 @@
+https://github.com/libLAS/libLAS/commit/8c4985384453a2df7254f05688b83706723bad7b.patch
+https://bugs.gentoo.org/789732
+
+From 8c4985384453a2df7254f05688b83706723bad7b Mon Sep 17 00:00:00 2001
+From: FX Coudert <fxcoudert@gmail.com>
+Date: Wed, 4 Oct 2017 11:51:23 +0200
+Subject: [PATCH] fix pointer comparison
+
+---
+ src/gt_citation.cpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/gt_citation.cpp b/src/gt_citation.cpp
+index 65fce31a..8d3966bc 100644
+--- a/src/gt_citation.cpp
++++ b/src/gt_citation.cpp
+@@ -155,7 +155,7 @@ char* ImagineCitationTranslation(char* psCitation, geokey_t keyID)
+         if(p1[0] == '\0' || p1[0] == '\n' || p1[0] == ' ')
+           p1 --;
+         p2 = p1 - 1;
+-        while( p2>0 && (p2[0] == ' ' || p2[0] == '\0' || p2[0] == '\n') )
++        while( p2 && (p2[0] == ' ' || p2[0] == '\0' || p2[0] == '\n') )
+           p2--;
+         if(p2 != p1 - 1)
+           p1 = p2;
+@@ -198,7 +198,7 @@ char* ImagineCitationTranslation(char* psCitation, geokey_t keyID)
+         if(p1[0] == '\0' || p1[0] == '\n' || p1[0] == ' ')
+           p1 --;
+         char* p2 = p1 - 1;
+-        while( p2>0 && (p2[0] == ' ' || p2[0] == '\0' || p2[0] == '\n') )
++        while( p2 && (p2[0] == ' ' || p2[0] == '\0' || p2[0] == '\n') )
+           p2--;
+         if(p2 != p1 - 1)
+           p1 = p2;

sci-geosciences/liblas/liblas-1.8.1-r3.ebuild

@@ -34,6 +34,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-CVE-2018-20540-fixup.patch # bug 698846
 	"${FILESDIR}"/${P}-fix-debug.patch # bug 668778
 	"${FILESDIR}"/${P}-boost-1.73.patch # bug 722878
+	"${FILESDIR}"/${P}-gcc11.patch # bug 789732
 )
 
 src_prepare() {