Fix casing of CMake modules to allow cross-compilation for Windows under Linux

The filesystem on Linux is case-sensitive so we need to get the casing
right when compiling on Linux for Windows.

src/CMakeLists.txt

@@ -62,7 +62,7 @@ if(USE_FTGL)
       SET(FTGL_INCLUDE_DIR ${FTGL_INCLUDE_DIRS})
       SET(FTGL_LIBRARY ${FTGL_LIBRARIES})
    else()
-      FIND_PACKAGE( ftgl REQUIRED )
+      FIND_PACKAGE(FTGL REQUIRED)
    endif()
 else(USE_FTGL)
     add_compile_options("-DNO_USE_FTGL")
@@ -113,7 +113,7 @@ if(WITH_INTERNAL_FLUIDSYNTH)
         INCLUDE_DIRECTORIES(${FLUIDSYNTH_INCLUDE_DIRS})
         SET(FLUIDSYNTH_LIBRARY ${FLUIDSYNTH_LIBRARIES})
     else()
-        FIND_PACKAGE( fluidsynth REQUIRED )
+        FIND_PACKAGE(FluidSynth REQUIRED)
     endif()
     ADD_DEFINITIONS(-DWITH_INTERNAL_FLUIDSYNTH)
     MESSAGE("Building with internal fluidsynth")