ensure correct mx primary suite for llvm compiler wrappers

mx.fastr/compilers/fastr-c++

@@ -40,7 +40,7 @@ while [ $DIR != "/" ] ; do
 done
 
 if [ $with_sulong = 1 ] && [ "$FASTR_SULONG_IGNORE" = "" ] ; then
-    mx --dynamicimport sulong fastr-c++ $@
+    MX_PRIMARY_SUITE_PATH=$DIR/fastr mx --dynamicimport sulong fastr-c++ $@
 else
     g++ $@
 fi

mx.fastr/compilers/fastr-cc

@@ -40,7 +40,7 @@ while [ $DIR != "/" ] ; do
 done
 
 if [ $with_sulong = 1 ] && [ "$FASTR_SULONG_IGNORE" = "" ] ; then
-	mx --dynamicimport sulong fastr-cc $@
+	MX_PRIMARY_SUITE_PATH=$DIR/fastr mx --dynamicimport sulong fastr-cc $@
 else
     gcc $@
 fi

mx.fastr/compilers/fastr-cpp

@@ -40,7 +40,7 @@ while [ $DIR != "/" ] ; do
 done
 
 if [ $with_sulong = 1 ] && [ "$FASTR_SULONG_IGNORE" = "" ] ; then
-	mx --dynamicimport sulong fastr-cpp $@
+	MX_PRIMARY_SUITE_PATH=$DIR/fastr mx --dynamicimport sulong fastr-cpp $@
 else
     cpp $@
 fi

mx.fastr/compilers/fastr-fc

@@ -40,7 +40,7 @@ while [ $DIR != "/" ] ; do
 done
 
 if [ $with_sulong = 1 ] && [ "$FASTR_SULONG_IGNORE" = "" ] ; then
-    mx --dynamicimport sulong fastr-fc $@
+    MX_PRIMARY_SUITE_PATH=$DIR/fastr mx --dynamicimport sulong fastr-fc $@
 else
     gfortran $@
 fi