conda: Macros: add '-L' argument to the linker command (CICE-Consorti…

…um#418)

On Linux, compiling CICE in serial mode under the conda environment
currently fails as the linker does not find the NetCDF libraries.

Compiling in parallel mode does work as the MPI compilation wrappers
seem to pass the necessary flag to the linker under the hood.

Explicitely tell the linker the location of the libraries using the
`SLIBS` variable in the Macros file. To be on the safe side, also do it
on macOS.

configuration/scripts/machines/Macros.conda_linux

@@ -40,7 +40,7 @@ LD:= $(FC)
 MODDIR  += -I$(CONDA_PREFIX)/include
 
 # Libraries to be passed to the linker
-SLIBS   := -lnetcdf -lnetcdff
+SLIBS   := -L$(CONDA_PREFIX)/lib -lnetcdf -lnetcdff
 
 # Necessary flag to compile with OpenMP support
 ifeq ($(ICE_THREADED), true)

configuration/scripts/machines/Macros.conda_macos

@@ -43,7 +43,7 @@ MODDIR  += -I$(CONDA_PREFIX)/include
 CFLAGS_HOST = -isysroot$(shell xcrun --show-sdk-path)
 
 # Libraries to be passed to the linker
-SLIBS   := -lnetcdf -lnetcdff
+SLIBS   := -L$(CONDA_PREFIX)/lib -lnetcdf -lnetcdff
 
 # Necessary flag to compile with OpenMP support
 ifeq ($(ICE_THREADED), true)