CMake: Fix extraction of TableGen lib from LLVM libs

The previous regex only happened to work because the TableGen lib
apparently used to be the first one. The new WindowsManifest lib is the
new first lib for LLVM 6.0.

The previous regex also didn't work on Windows/MSVC as the
LLVM_LIBRARIES entry doesn't start with `-`; it looks like
`C:\...\LLVMTableGen.lib`.

Author: kinke

CMakeLists.txt

@@ -28,8 +28,11 @@ find_package(LLVM 3.7 REQUIRED
     windowsmanifest ${EXTRA_LLVM_MODULES})
 math(EXPR LDC_LLVM_VER ${LLVM_VERSION_MAJOR}*100+${LLVM_VERSION_MINOR})
 # Remove LLVMTableGen library from list of libraries
-string(REGEX MATCH "^-.*LLVMTableGen[^;]*;|;-.*LLVMTableGen[^;]*" LLVM_TABLEGEN_LIBRARY "${LLVM_LIBRARIES}")
-string(REGEX REPLACE "^-.*LLVMTableGen[^;]*;|;-.*LLVMTableGen[^;]*" "" LLVM_LIBRARIES "${LLVM_LIBRARIES}")
+message(STATUS "${LLVM_LIBRARIES}")
+string(REGEX MATCH "[^;]*LLVMTableGen[^;]*" LLVM_TABLEGEN_LIBRARY "${LLVM_LIBRARIES}")
+message(STATUS "${LLVM_TABLEGEN_LIBRARY}")
+string(REGEX REPLACE "[^;]*LLVMTableGen[^;]*;?" "" LLVM_LIBRARIES "${LLVM_LIBRARIES}")
+message(STATUS "${LLVM_LIBRARIES}")
 
 # Information about which targets LLVM was built to target
 foreach(LLVM_SUPPORTED_TARGET ${LLVM_TARGETS_TO_BUILD})