package/libgeos: needs gcc >= 4.9

libgeos needs gcc >= 4.9 since bump to version 3.12.0 in commit
16727d4595dd1972a46e92bbd2260a896cc19b60 and
https://github.com/libgeos/geos/commit/289ed4efb26a9944f4385381e1574184b1e7448e:

In file included from /home/thomas/autobuild/instance-0/output-1/build/libgeos-3.12.0/src/algorithm/ConvexHull.cpp:30:0:
/home/thomas/autobuild/instance-0/output-1/build/libgeos-3.12.0/include/geos/util.h:38:12: error: 'std::make_unique' has not been declared
 using std::make_unique;
            ^

This dependency is propagated to libgeos only reverse dependency,
postgis.

Fixes:
 - http://autobuild.buildroot.org/results/56bb572fb1d56d45dbb950a73b9b888239fa6968

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f0d4bf1df5838c3aba678ca21d6ce2214f0466e0)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgeos/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_LIBGEOS
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_USE_WCHAR
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # C++14
 	depends on !BR2_TOOLCHAIN_HAS_BINUTILS_BUG_27597
 	help
 	  GEOS (Geometry Engine - Open Source) is a C++ port of the
@@ -13,7 +14,8 @@ config BR2_PACKAGE_LIBGEOS
 
 	  https://trac.osgeo.org/geos
 
-comment "libgeos needs a toolchain w/ C++, wchar, threads not binutils bug 27597"
+comment "libgeos needs a toolchain w/ C++, wchar, gcc >= 4.9, threads not binutils bug 27597"
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR || \
 		   !BR2_TOOLCHAIN_HAS_THREADS || \
+		   !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 || \
 		   BR2_TOOLCHAIN_HAS_BINUTILS_BUG_27597

package/postgis/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_POSTGIS
 	bool "postgis"
 	depends on BR2_PACKAGE_POSTGRESQL_FULL
 	depends on BR2_INSTALL_LIBSTDCPP # libgeos, proj
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 # C++11, proj
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # libgeos
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libgeos, proj
 	depends on BR2_USE_WCHAR # libgeos, proj
 	depends on !BR2_TOOLCHAIN_HAS_BINUTILS_BUG_27597 # libgeos
@@ -18,7 +18,7 @@ config BR2_PACKAGE_POSTGIS
 
 	  https://postgis.net/
 
-comment "postgis needs a toolchain w/ C++, threads, wchar, gcc >= 4.7, not binutils bug 27597"
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 || \
+comment "postgis needs a toolchain w/ C++, threads, wchar, gcc >= 4.9, not binutils bug 27597"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 || \
 		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR || \
 		BR2_TOOLCHAIN_HAS_BINUTILS_BUG_27597