fix: ensure that dsymutil available even when FORCE_USE_SYSTEM_CLANG=1

`dsymutil` is defined as only available in `cctools` but Guix builds
with `FORCE_USE_SYSTEM_CLANG`, which omits `cctools` (and therefore,
`dsymutil`) but we use `dsymutil` to generate debug symbols, so we need
to make sure that we get `dsymutil` one way or another.

Author: kwvg

depends/hosts/darwin.mk

@@ -8,13 +8,17 @@ OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-
 
 darwin_native_binutils=native_cctools
 
+cctools_TOOLS=AR RANLIB STRIP NM
+
 ifeq ($(strip $(FORCE_USE_SYSTEM_CLANG)),)
 # FORCE_USE_SYSTEM_CLANG is empty, so we use our depends-managed, pinned clang
 # from llvm.org
 
 # Clang is a dependency of native_cctools when FORCE_USE_SYSTEM_CLANG is empty
 darwin_native_toolchain=native_cctools
 
+cctools_TOOLS+=" DSYMUTIL"
+
 clang_prog=$(build_prefix)/bin/clang
 clangxx_prog=$(clang_prog)++
 llvm_config_prog=$(build_prefix)/bin/llvm-config
@@ -40,11 +44,10 @@ llvm_config_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-config")
 
 llvm_lib_dir=$(shell $(llvm_config_prog) --libdir)
 
+darwin_DSYMUTIL=$(shell $(SHELL) $(.SHELLFLAGS) "command -v dsymutil")
 darwin_OBJDUMP=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-objdump")
 endif
 
-cctools_TOOLS=AR RANLIB STRIP NM DSYMUTIL
-
 # Make-only lowercase function
 lc = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))