cmake: Fix finding libunwind

The libfind_process macro expects <lib>_PROCESS_INCLUDES to be set to
the names of variables containing the include paths, not the include
paths themselves.  This was causing find_package(libunwind) to always
fail, even when the necessary files were correctly found by find_path
and find_library.

Signed-off-by: Pavon <[email protected]>

Author: Pavon

cmake/Modules/Findlibunwind.cmake

@@ -25,7 +25,7 @@ find_library(libunwind_LIBRARY
 
 # Set the include dir variables and the libraries and let libfind_process do the rest.
 # NOTE: Singular variables for this library, plural for libraries this this lib depends on.
-set(libunwind_PROCESS_INCLUDES ${libunwind_INCLUDE_DIR})
+set(libunwind_PROCESS_INCLUDES libunwind_INCLUDE_DIR)
 set(libunwind_PROCESS_LIBS libunwind_LIBRARY)
 libfind_process(libunwind)