more -fdelete-null-pointer-checks additions for ports-gcc

The following ports need -fdelete-null-pointer-checks to build with
ports-gcc:
- productivity/libphonenumber
- www/webkitgtk4
- x11/qt6/qtdeclarative
- x11/qt6/qtgrpc

All these build with
CXXFLAGS_ports-gcc = -fdelete-null-pointer-checks

--
:wq Claudio

Index: productivity/libphonenumber/Makefile
===================================================================
RCS file: /cvs/ports/productivity/libphonenumber/Makefile,v
diff -u -p -r1.87 Makefile
--- productivity/libphonenumber/Makefile 16 Jan 2026 07:54:07 -0000 1.87
+++ productivity/libphonenumber/Makefile 26 Jan 2026 13:26:10 -0000
@@ -41,6 +41,8 @@ MODULES = devel/cmake

COMPILER = base-clang ports-gcc

+CXXFLAGS_ports-gcc = -fdelete-null-pointer-checks
+
BUILD_DEPENDS = devel/gtest

LIB_DEPENDS = devel/abseil-cpp \
Index: www/webkitgtk4/Makefile
===================================================================
RCS file: /cvs/ports/www/webkitgtk4/Makefile,v
diff -u -p -r1.250 Makefile
--- www/webkitgtk4/Makefile 19 Dec 2025 13:16:15 -0000 1.250
+++ www/webkitgtk4/Makefile 26 Jan 2026 13:18:21 -0000
@@ -48,6 +48,8 @@ SITES = https://webkitgtk.org/releases

COMPILER = base-clang ports-gcc

+CXXFLAGS_ports-gcc = -fdelete-null-pointer-checks
+
MODULES = devel/cmake \
lang/python \
lang/ruby \
Index: x11/qt6/qtdeclarative/Makefile
===================================================================
RCS file: /cvs/ports/x11/qt6/qtdeclarative/Makefile,v
diff -u -p -r1.27 Makefile
--- x11/qt6/qtdeclarative/Makefile 9 Dec 2025 21:00:38 -0000 1.27
+++ x11/qt6/qtdeclarative/Makefile 27 Jan 2026 12:43:48 -0000
@@ -61,6 +61,8 @@ WANTLIB += Qt6Sql Qt6Svg Qt6Test Qt6Widg
MODULES = lang/python
CONFIGURE_STYLE = cmake

+CXXFLAGS_ports-gcc = -fdelete-null-pointer-checks
+
MODQT6_DEPS = No

BUILD_DEPENDS = graphics/vulkan-loader \
Index: x11/qt6/qtgrpc/Makefile
===================================================================
RCS file: /cvs/ports/x11/qt6/qtgrpc/Makefile,v
diff -u -p -r1.17 Makefile
--- x11/qt6/qtgrpc/Makefile 16 Jan 2026 07:54:07 -0000 1.17
+++ x11/qt6/qtgrpc/Makefile 26 Jan 2026 13:58:39 -0000
@@ -42,6 +42,8 @@ WANTLIB += absl_time absl_time_zone absl
WANTLIB += absl_vlog_config_internal c m protobuf protoc utf8_range
WANTLIB += utf8_validity

+CXXFLAGS_ports-gcc = -fdelete-null-pointer-checks
+
BUILD_DEPENDS = graphics/glslang

LIB_DEPENDS = devel/abseil-cpp \