cmake: Fix static linking to dependencies with "-" in library name

When SDL is built with Wayland support on Linux, and Wayland libraries
are linked as dependencies instead of being loaded with dlopen(), its
dependencies will include libraries whose names contain a dash, like
`-lwayland-client` and `-ldecor-0`. Don't replace such libraries with
`-lwayland` and `-ldecor`: those don't exist and linking them will fail.

Signed-off-by: Simon McVittie <smcv@collabora.com>

sdl2-config.cmake.in

@@ -53,12 +53,12 @@ set(_sdl2_libraries "@SDL_LIBS@")
 set(_sdl2_static_private_libs "@SDL_STATIC_LIBS@")
 
 # Convert _sdl2_libraries to list and keep only libraries
-string(REGEX MATCHALL "-[lm]([a-zA-Z0-9._]+)" _sdl2_libraries "${_sdl2_libraries}")
+string(REGEX MATCHALL "-[lm]([-a-zA-Z0-9._]+)" _sdl2_libraries "${_sdl2_libraries}")
 string(REGEX REPLACE "^-l" "" _sdl2_libraries "${_sdl2_libraries}")
 string(REGEX REPLACE ";-l" ";" _sdl2_libraries "${_sdl2_libraries}")
 
 # Convert _sdl2_static_private_libs to list and keep only libraries
-string(REGEX MATCHALL "(-[lm]([a-zA-Z0-9._]+))|(-Wl,[^ ]*framework[^ ]*)" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
+string(REGEX MATCHALL "(-[lm]([-a-zA-Z0-9._]+))|(-Wl,[^ ]*framework[^ ]*)" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
 string(REGEX REPLACE "^-l" "" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
 string(REGEX REPLACE ";-l" ";" _sdl2_static_private_libs "${_sdl2_static_private_libs}")