[CMake] Fix order of GNUInstallDirs module (#15966)

In CMakeLists.txt, the variables CMAKE_INSTALL_<dir> are
referenced before the execution of GNUInstallDirs module.
This order is incorrect as the variables are defined by
the GNUInstallDirs module.

Since the variables are undefined, INTERFACE_INCLUDE_DIRECTORIES
property is not set in the tvmTargets.cmake. This causes external
applications based on TVM unable to find TVM runtime headers.

Signed-off-by: Srikanth Yalavarthi <[email protected]>

CMakeLists.txt

@@ -566,6 +566,7 @@ add_library(tvm_objs OBJECT ${COMPILER_SRCS})
 add_library(tvm_runtime_objs OBJECT ${RUNTIME_SRCS})
 add_library(tvm_libinfo_objs OBJECT ${LIBINFO_FILE})
 
+include(GNUInstallDirs)
 if(NOT BUILD_DUMMY_LIBTVM)
   add_library(tvm SHARED $<TARGET_OBJECTS:tvm_objs> $<TARGET_OBJECTS:tvm_runtime_objs> $<TARGET_OBJECTS:tvm_libinfo_objs>)
 else()
@@ -783,7 +784,6 @@ else(INSTALL_DEV)
     )
 endif(INSTALL_DEV)
 
-include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
 set(PROJECT_CONFIG_CONTENT "@PACKAGE_INIT@\n")
 string(APPEND PROJECT_CONFIG_CONTENT "include(CMakeFindDependencyMacro)\n")