Fix parsing error when finding an existing GMT in macos (#1735)

Author: ZMAlt

deps/build.jl

@@ -12,13 +12,13 @@ function get_de_libnames()
 		libgmt = haskey(ENV, "GMT_LIBRARY") ? ENV["GMT_LIBRARY"] : string(chop(read(`gmt --show-library`, String)))
 
 		@static Sys.iswindows() ? libgdal = "gdal_w64.dll" : (
-			Sys.isapple() ? (libgdal = string(split(readlines(pipeline(`otool -L $(libgmt)`, `grep libgdal`))[1])[1])[8:end]) : (
+			Sys.isapple() ? (libgdal = string(split(readlines(pipeline(`otool -L $(libgmt)`, `grep libgdal`))[1])[1])) : (
 					Sys.isunix() ? (libgdal = string(split(readlines(pipeline(`ldd $(libgmt)`, `grep libgdal`))[1])[3])) :
 					error("Don't know how to use GDAL this package in this OS.")
 				)
 			)
 		@static Sys.iswindows() ? libproj = "proj_w64.dll" : (
-			Sys.isapple() ? (libproj = string(split(readlines(pipeline(`otool -L $(libgdal)`, `grep libproj`))[1])[1])[8:end]) : (
+			Sys.isapple() ? (libproj = string(split(readlines(pipeline(`otool -L $(libgdal)`, `grep libproj`))[1])[1])) : (
 					Sys.isunix() ? (libproj = string(split(readlines(pipeline(`ldd $(libgdal)`, `grep libproj`))[1])[3])) :
 					error("Don't know how to use PROJ4 in this OS.")
 				)