Makefile: avoid libtinfo and libz dependency of LLVM

These two dependencies are optional but enabled by default when
available. Disable them in the Makefile so that the tinygo binary is
portable to systems that don't have them or have a different version
(for example, Arch has a newer version of libcurses and thus libtinfo).

.circleci/config.yml

@@ -118,7 +118,6 @@ commands:
           name: "Install apt dependencies"
           command: |
             sudo apt-get install \
-                libtinfo-dev \
                 python3 \
                 gcc-arm-linux-gnueabihf \
                 binutils-arm-none-eabi \
@@ -137,7 +136,7 @@ commands:
       - llvm-source-linux
       - restore_cache:
           keys:
-            - llvm-build-8-v2
+            - llvm-build-8-linux-v4
       - run:
           name: "Build LLVM"
           command: |
@@ -155,7 +154,7 @@ commands:
               make llvm-build
             fi
       - save_cache:
-          key: llvm-build-8-v2
+          key: llvm-build-8-linux-v4
           paths:
             llvm-build
       - run:
@@ -208,7 +207,7 @@ commands:
             - llvm
       - restore_cache:
           keys:
-            - llvm-build-8-macos-v2
+            - llvm-build-8-macos-v3
       - run:
           name: "Build LLVM"
           command: |
@@ -220,7 +219,7 @@ commands:
               make llvm-build
             fi
       - save_cache:
-          key: llvm-build-8-macos-v2
+          key: llvm-build-8-macos-v3
           paths:
             llvm-build
       - run:

Makefile

@@ -69,7 +69,7 @@ llvm-source: llvm/README.txt llvm/tools/clang/README.txt llvm/tools/lld/README.m
 
 # Configure LLVM.
 llvm-build/build.ninja: llvm-source
-	mkdir -p llvm-build; cd llvm-build; cmake -G Ninja ../llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR" -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=OFF -DLIBCLANG_BUILD_STATIC=ON
+	mkdir -p llvm-build; cd llvm-build; cmake -G Ninja ../llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR" -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=OFF -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF
 
 # Build LLVM.
 llvm-build: llvm-build/build.ninja