support/misc/toolchainfile.cmake.in: use TARGET_LDFLAGS for shared and module libraries

With cmake packages, we are only using TARGET_LDFLAGS for executables
and not for shared libraries.

This patch adds CMAKE_SHARED_LINKER_FLAGS and
CMAKE_MODULE_LINKER_FLAGS to the cmake toolchain file so that
buildroot TARGET_LDFLAGS are used for shared and module libraries.

Signed-off-by: Damien Thébault <damien.thebault@vitec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/misc/toolchainfile.cmake.in

@@ -45,6 +45,8 @@ set(CMAKE_BUILD_TYPE @@CMAKE_BUILD_TYPE@@ CACHE STRING "Buildroot build configur
 set(CMAKE_C_FLAGS "@@TARGET_CFLAGS@@" CACHE STRING "Buildroot CFLAGS")
 set(CMAKE_CXX_FLAGS "@@TARGET_CXXFLAGS@@" CACHE STRING "Buildroot CXXFLAGS")
 set(CMAKE_EXE_LINKER_FLAGS "@@TARGET_LDFLAGS@@" CACHE STRING "Buildroot LDFLAGS for executables")
+set(CMAKE_SHARED_LINKER_FLAGS "@@TARGET_LDFLAGS@@" CACHE STRING "Buildroot LDFLAGS for shared libraries")
+set(CMAKE_MODULE_LINKER_FLAGS "@@TARGET_LDFLAGS@@" CACHE STRING "Buildroot LDFLAGS for module libraries")
 
 set(CMAKE_INSTALL_SO_NO_EXE 0)