llvm: add missing configuration option LLVM_LINK_LLVM_DYLIB

we define LLVM_BUILD_LLVM_DYLIB=1 BUT not LLVM_LINK_LLVM_DYLIB=1 which
leads to a broken llvm-config.

Currently

$> llvm-config --libnames --link-shared

generated lots of errors about missing .so libraries, with the above
addition we get the correct behaviour.

$> llvm-config --libnames --link-shared
libLLVM-7.so

llvm/.signature

@@ -1,6 +1,6 @@
 untrusted comment: verify with /etc/ports/opt.pub
-RWSE3ohX2g5d/QN2q4K6+ajfE+v6EtgMRGFIrPNGxTdRtZr6eFJSlZL7dygemaV99+TuBPnStQvOT5nGsjnBymqMC3A3i5nWVw0=
-SHA256 (Pkgfile) = 92229aa65be835c271017558c1c8b5f2c7be715332a69c27cf9625a6d52bb00f
+RWSE3ohX2g5d/cXW0okQDvCXarmoluwqNXPGbaF/5ggSywnazLLV/AO8UoaO2fsd0S9qBIqOxDDMU9OfOwW4zYTLcbP+SwQYCAQ=
+SHA256 (Pkgfile) = f4e5f36461301e29fa3a5bcf42e83f6d7fb9dc74a60de4b817542e8648a96cf6
 SHA256 (.footprint) = 337a262a51bfc457279d6f428dcbbb8bb7d563577d407d5ce982e923ef3dd450
 SHA256 (llvm-7.0.0.src.tar.xz) = 8bc1f844e6cbde1b652c19c1edebc1864456fd9c78b8c1bea038e51b363fe222
 SHA256 (llvm-config.h) = 2227b83b904348e5530f3475c978e11cb0f05a85024781dcb49ac86b65582707

llvm/Pkgfile

@@ -5,7 +5,7 @@
 
 name=llvm
 version=7.0.0
-release=1
+release=2
 source=(https://llvm.org/releases/$version/$name-$version.src.tar.xz
   llvm-config.h)
 
@@ -27,6 +27,7 @@ build() {
     -DLLVM_ENABLE_OCAMLDOC=0 \
     -DLLVM_TARGETS_TO_BUILD='X86;AMDGPU;BPF' \
     -DLLVM_BUILD_LLVM_DYLIB=1 \
+    -DLLVM_LINK_LLVM_DYLIB=1 \
     -DLLVM_INSTALL_UTILS=1 \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_INSTALL_PREFIX=/usr \