protobuf: don't use shared libraries for host

Avoids needing to handle rpath.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/protobuf/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=protobuf
 PKG_VERSION:=3.17.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-cpp-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/google/protobuf/releases/download/v$(PKG_VERSION)
@@ -67,10 +67,8 @@ endef
 CMAKE_HOST_OPTIONS += \
 	-Dprotobuf_BUILD_PROTOC_BINARIES=ON \
 	-Dprotobuf_BUILD_TESTS=OFF \
-	-DBUILD_SHARED_LIBS=ON \
-	-DCMAKE_SKIP_RPATH=OFF \
-	-DCMAKE_INSTALL_LIBDIR=lib \
-	-DCMAKE_INSTALL_RPATH="${STAGING_DIR_HOSTPKG}/lib"
+	-DBUILD_SHARED_LIBS=OFF \
+	-DCMAKE_INSTALL_LIBDIR=lib
 
 CMAKE_OPTIONS += \
 	-Dprotobuf_BUILD_PROTOC_BINARIES=ON \
@@ -78,7 +76,7 @@ CMAKE_OPTIONS += \
 	-Dprotobuf_WITH_ZLIB=ON \
 	-DBUILD_SHARED_LIBS=ON
 
-TARGET_LDFLAGS += -latomic $(if $(CONFIG_USE_GLIBC),-lm)
+TARGET_LDFLAGS += -latomic
 
 define Build/InstallDev
 	$(call Build/InstallDev/cmake,$(1))