golang: Use clang for native build

packages/golang/build.sh

@@ -21,7 +21,7 @@ termux_step_make_install () {
 	cd $TERMUX_PKG_SRCDIR/src
 	env CC_FOR_TARGET=$CC \
 	    CXX_FOR_TARGET=$CXX \
-	    CC=gcc \
+	    CC=clang \
 	    GO_LDFLAGS="-extldflags=-pie" \
 	    GOROOT_BOOTSTRAP=$GOROOT \
 	    GOROOT_FINAL=$TERMUX_GODIR \

scripts/setup-ubuntu.sh

@@ -5,6 +5,7 @@ PACKAGES="$PACKAGES ant"			# Used by jack and aptsigner.
 PACKAGES="$PACKAGES asciidoc"
 PACKAGES="$PACKAGES automake"
 PACKAGES="$PACKAGES bison"
+PACKAGES="$PACKAGES clang"			# Used by golang, useful to have same compiler building.
 PACKAGES="$PACKAGES curl"			# Used for fetching sources.
 PACKAGES="$PACKAGES flex"
 PACKAGES="$PACKAGES gettext"			# Provides 'msgfmt' which the apt build uses.