Corrected a pair of custom mask hints added to the sky130_fd_sc_hd
cell to prevent issues with writing hierarchical GDS.  The areas
in the hint were rounded off, leading to the addition of slivers
of PSDM added over the tap cell on output and potentially causing
DRC spacing errors to neighboring cells.
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 92f9fd5..8215e18 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -1144,9 +1144,9 @@
 	# Add a maskhint set for the tap cell .mag view to prevent problems writing
 	# when writing NSDM and PSDM to GDS during hierarchical adjustments.
 	${ADDPROP} ${STAGING_PATH}/${SKY130$*} sky130_fd_sc_hd sky130_fd_sc_hd__tapvpwrvgnd_1 \
-		"MASKHINTS_PSDM 0 38 92 196" -mag
+		"MASKHINTS_PSDM 0 38 92 195" -mag
 	${ADDPROP} ${STAGING_PATH}/${SKY130$*} sky130_fd_sc_hd sky130_fd_sc_hd__tapvpwrvgnd_1 \
-		"MASKHINTS_NSDM 0 280 92 506" -mag
+		"MASKHINTS_NSDM 0 279 92 506" -mag
 	# Remove the base verilog files which have already been included into
 	# the libraries
 	${RM} ${STAGING_PATH}/${SKY130$*}/libs.ref/${HD_VERILOG}/*.*.v