math/scilab: Fix parallel build with gmake 4.4

Remove prerequisites from .NOTPARALLEL to restore the behaviour from
previous versions of gmake.

PR:             272216
Reported by:    antoine

math/scilab/files/patch-Makefile.in

@@ -0,0 +1,11 @@
+--- Makefile.in.orig	2021-07-15 11:54:56 UTC
++++ Makefile.in
+@@ -2517,7 +2517,7 @@ install-data-local:
+
+ .PHONY: macros localization doc strip-debug
+
+-.NOTPARALLEL: macros doc
++.NOTPARALLEL:
+
+ # Construct the LD_LIBRARY_PATH from the variable detected previously
+ # Run the unitary test of call_scilab

math/scilab/files/patch-modules_Makefile.in

@@ -0,0 +1,11 @@
+--- modules/Makefile.in.orig	2021-07-15 11:55:11 UTC
++++ modules/Makefile.in
+@@ -1137,7 +1137,7 @@ uninstall-am: uninstall-pkglibLTLIBRARIES
+ .PRECIOUS: Makefile
+
+
+-.NOTPARALLEL: libscilab-cli.la libscilab.la
++.NOTPARALLEL:
+
+ # Tell versions [3.59,3.63) of GNU make to not export all variables.
+ # Otherwise a system limit (for SysV at least) may be exceeded.