Update tinygo version to v0.26.0 to fix version detection

tinygo failed to detect the go version;

    tinygo_test.go:22: empty: tinygo build [build -o=nativebin .]; output: error: could not read version from GOROOT (/opt/hostedtoolcache/go/1.19.3/x64): Invalid go version output:
        // Code generated by go tool dist; DO NOT EDIT.

        package sys

        const StackGuardMultiplierDefault = 1

This was due to changes in go, and fixed in tinygo v0.23 and up:
tinygo-org/tinygo@e060e58

This version of tinygo requires go1.18 or up, so adding a build-constraint
for the test:

    tinygo_test.go:28: empty: tinygo [build -target=arduino-nano33 -o=arduino-nano33.bin .]
    tinygo_test.go:28: empty: tinygo build [build -target=arduino-nano33 -o=arduino-nano33.bin .];
    output: error: requires go version 1.18 through 1.19, got go1.14

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Makefile

@@ -49,8 +49,8 @@ travis:
 	if [ `arch` == 'x86_64' ]; then \
 		sudo apt-get -y -q update; \
 		sudo apt-get -y -q install build-essential; \
-		wget -q https://github.com/tinygo-org/tinygo/releases/download/v0.18.0/tinygo_0.18.0_amd64.deb; \
-		sudo dpkg -i tinygo_0.18.0_amd64.deb; \
+		wget -q https://github.com/tinygo-org/tinygo/releases/download/v0.26.0/tinygo_0.26.0_amd64.deb; \
+		sudo dpkg -i tinygo_0.26.0_amd64.deb; \
 		export PATH=$$PATH:/usr/local/tinygo/bin; \
 	fi
 	go get -d -t ./...

tinygotest/tinygo_test.go

@@ -1,4 +1,4 @@
-// +build amd64 darwin
+// +build amd64,go1.18 darwin,go1.18
 
 package tinygotest