python,python3: add host-flags/settings to host pip install rules

The host pip install should have the host's CFLAGS, LDFLAGS, etc
available.
And not the target's flags.
Otherwise, weird things can happen when installing
packages (host-side) that need to build C code.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/python/files/python-host.mk

@@ -37,21 +37,26 @@ define HostPython
 	$(HOST_PYTHON_BIN) $(2);
 endef
 
+define host_python_settings
+	ARCH="$(HOST_ARCH)" \
+	CC="$(HOSTCC)" \
+	CCSHARED="$(HOSTCC) $(HOST_FPIC)" \
+	CXX="$(HOSTCXX)" \
+	LD="$(HOSTCC)" \
+	LDSHARED="$(HOSTCC) -shared" \
+	CFLAGS="$(HOST_CFLAGS)" \
+	CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON_INC_DIR)" \
+	LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON_VERSION) -Wl$(comma)-rpath=$(STAGING_DIR_HOSTPKG)/lib" \
+	_PYTHON_HOST_PLATFORM=linux2
+endef
+
 # $(1) => commands to execute before running pythons script
 # $(2) => python script and its arguments
 # $(3) => additional variables
 define Build/Compile/HostPyRunHost
 	$(call HostPython, \
 		$(if $(1),$(1);) \
-		CC="$(HOSTCC)" \
-		CCSHARED="$(HOSTCC) $(HOST_FPIC)" \
-		CXX="$(HOSTCXX)" \
-		LD="$(HOSTCC)" \
-		LDSHARED="$(HOSTCC) -shared" \
-		CFLAGS="$(HOST_CFLAGS)" \
-		CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON_INC_DIR)" \
-		LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON_VERSION) -Wl$(comma)-rpath=$(STAGING_DIR_HOSTPKG)/lib" \
-		_PYTHON_HOST_PLATFORM=linux2 \
+		$(call host_python_settings) \
 		$(3) \
 		, \
 		$(2) \
@@ -63,6 +68,7 @@ endef
 # Note: I shamelessly copied this from Yousong's logic (from python-packages);
 HOST_PYTHON_PIP:=$(STAGING_DIR_HOSTPKG)/bin/pip$(PYTHON_VERSION)
 define host_python_pip_install
+	$(call host_python_settings) \
 	$(HOST_PYTHON_PIP) install \
 		--root=$(1) \
 		--prefix=$(2) \

lang/python/python3/files/python3-host.mk

@@ -37,21 +37,26 @@ define HostPython3
 	$(HOST_PYTHON3_BIN) $(2);
 endef
 
+define host_python3_settings
+	ARCH="$(HOST_ARCH)" \
+	CC="$(HOSTCC)" \
+	CCSHARED="$(HOSTCC) $(HOST_FPIC)" \
+	CXX="$(HOSTCXX)" \
+	LD="$(HOSTCC)" \
+	LDSHARED="$(HOSTCC) -shared" \
+	CFLAGS="$(HOST_CFLAGS)" \
+	CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON3_INC_DIR)" \
+	LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON3_VERSION) -Wl$(comma)-rpath=$(STAGING_DIR_HOSTPKG)/lib" \
+	_PYTHON_HOST_PLATFORM=linux2
+endef
+
 # $(1) => commands to execute before running pythons script
 # $(2) => python script and its arguments
 # $(3) => additional variables
 define Build/Compile/HostPy3RunHost
 	$(call HostPython3, \
 		$(if $(1),$(1);) \
-		CC="$(HOSTCC)" \
-		CCSHARED="$(HOSTCC) $(HOST_FPIC)" \
-		CXX="$(HOSTCXX)" \
-		LD="$(HOSTCC)" \
-		LDSHARED="$(HOSTCC) -shared" \
-		CFLAGS="$(HOST_CFLAGS)" \
-		CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON3_INC_DIR)" \
-		LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON3_VERSION) -Wl$(comma)-rpath=$(STAGING_DIR_HOSTPKG)/lib" \
-		_PYTHON_HOST_PLATFORM=linux2 \
+		$(call host_python3_settings) \
 		$(3) \
 		, \
 		$(2) \
@@ -63,6 +68,7 @@ endef
 # Note: I shamelessly copied this from Yousong's logic (from python-packages);
 HOST_PYTHON3_PIP:=$(STAGING_DIR_HOSTPKG)/bin/pip$(PYTHON3_VERSION)
 define host_python3_pip_install
+	$(call host_python3_settings) \
 	$(HOST_PYTHON3_PIP) install \
 		--root=$(1) \
 		--prefix=$(2) \