CMakeLists: Re-enable pkgconfig, require libdrm

This was an implicit requirement, but the change to needing libdrm/drm.h
means we should be explicitly looking for this package during the build

Change-Id: I75064bf6f5477cb1ca99318681afca76c0060f72

CMakeLists.txt

@@ -148,18 +148,20 @@ target_include_directories( ${HSAKMT_TARGET}
   PRIVATE
   ${CMAKE_CURRENT_SOURCE_DIR}/src )
 
-target_compile_options(${HSAKMT_TARGET} PRIVATE ${HSAKMT_C_FLAGS})
 set_property(TARGET ${HSAKMT_TARGET} PROPERTY LINK_FLAGS ${HSAKMT_LINK_FLAGS})
 
 ## Set the VERSION and SOVERSION values
 set_property ( TARGET ${HSAKMT_TARGET} PROPERTY VERSION "${LIB_VERSION_STRING}" )
 set_property ( TARGET ${HSAKMT_TARGET} PROPERTY SOVERSION "${LIB_VERSION_MAJOR}" )
 
-#find_package(PkgConfig)
+find_package(PkgConfig)
+pkg_check_modules(LIBDRM REQUIRED libdrm)
 target_link_libraries ( ${HSAKMT_TARGET}
   PRIVATE pthread rt numa
 )
 
+target_compile_options(${HSAKMT_TARGET} PRIVATE ${LIBDRM_CFLAGS} ${HSAKMT_C_FLAGS})
+
 ## Define default paths and packages.
 if( CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT )
   set ( CMAKE_INSTALL_PREFIX "/opt/rocm" )